text:
## Regex Does Not Contain

Hence, to facilitate Regex in Excel you need to use User Defined Functions – functions defined in VBA but accessible as regular functions in Excel. RegEx match open tags except XHTML self-contained tags. Please advise. pU'U&U3U5"V XV ^V kV V VNV[ W W rW WvW. Notice that browsers sometimes hides the last ”/” from the url field – even though it exists. contains(pat, case=True, flags=0, na=nan, regex=True) Parameter :. You can also check for "\sOT" and "OT\s" but the last one matches also "NOT ". Note: The regular expression (regex) matches any character except a line terminator. I am new to ansible, kindly answer those question even though it was silly. jsoup is a Java library for working with real-world HTML. )*$[/code]You can test it here. The default time-out interval is Regex. Example: Make sure that answers contain the word "candy," or are formatted as an email address or URL. match_continuous: Continuous. Regular expressions are available in Calc as follows:. NET or Perl. It matches them in the order and case in which they are written. png 1318×740 146 KB. here # regex match against any of the known request headers. However, my name regex is failing with the &. A typical use for regular expressions is in finding text; for instance to locate all cells containing man or woman in your spreadsheet, you could search using a single regular expression. ing$ matches "exciting" but not "ingenious" See also: Regular Expression Character Classes CheatSheet. You could use this type of code in other macros, to check a specific sheet for an AutoFilter. You can upload multiple images at once. ing$matches "exciting" but not "ingenious" See also: Regular Expression Character Classes CheatSheet. In the following construction I start with a DFA for $\overline{101}$ which I then convert to a DFA and then into a sequence of GNFA's. Note that the token won't be available after CSRFHandler finishes (that is, in another handler that wraps it, or after the request has been served) func VerifyToken ¶ Uses. Browse other questions tagged grep regular-expression pipe or ask your own question. See the java. , 1, +1, -0. The escape sequence "\b" does not match as a beginning-of-word. The fundamental building blocks are the regular expressions that match a single character. FINDSTR does not support UTF-16 files, but FIND does. The includes() method is case sensitive. When you search for a text string that contains special regex symbols, IntelliJ IDEA automatically escapes them with backlash \ in the search field. Returns documents that contain terms matching a regular expression. If the regular expression doesn't match, then is displayed. These are encoded in the pattern by the use of special characters, which do not stand for themselves but instead are interpreted in some special way. And you could use the regex _\d+_ to find digits within underscores (as in _12_) and to replace the underscores with double dashes, yielding --12--, something you could not do with a conventional search-and-replace (details for that technique are in the recipe about replacing one delimiter with another). If not found, 0 is returned. Short for regular expression, a regex is a string of text that allows you to create patterns that help match, locate, and manage text. 2Conﬁguratuion 1. Java supports Regular expression on String and it's very powerful. It works differently, but you can use regular expressions in Google Analytics API queries: Image courtesy You can also use regular expressions in filter expressions using the =~ and !~ operators. Username Regular Expression Pattern ^[a-z0-9_-]{3,15}$ Description ^ # Start of the line [a-z0-9_-] # Match characters and symbols in the list, a-z, 0-9, underscore, hyphen {3,15} # Length at least 3 characters and maximum length of 15 $# End of the line. Abap Style; Algol Style; Algol_Nu Style; Arduino Style; Autumn Style; Borland Style; BlackWhite Style; Colorful Style; Default Style; Emacs Style; Friendly. We currently have 9,634 members registered. a finite state automata given a regular expression, and an algorithm is given that derives the regular expression given a finite state automata. Iterating a file line by line, I need to extract the lines containing the word 'input', AND not containing the word 'type'. IF does not, by itself, set or clear the Errorlevel. In the above example, this would match "dall," "dell," "dill," "doll," and "dull" since they contain a "d" at the first and "ll" at the end. Then, let EQ SF − REX = { | R and S are equivalent star-free regular expressions}. https://bugs. Each expression can contain characters, metacharacters, operators, tokens, and flags that specify patterns to match in str. match_continuous: Continuous. For Regex patterns to match to request, keep the default selection of Create regex pattern set. x 7(J')J:QJnJ;J 7K_PK%KJKJ!L$lL%LyL|1MM={N&N N!O. This guide describes how to use and manage Evolution™ 2. InfiniteMatchTimeout, which means that the regular expression will not time out. It will evaluate to true if the following critera are met: Must be 8 characters in length total. Escape converts a string so that the regular expression engine will interpret any metacharacters that it may contain as character literals. Gelatin Documentation, Release 0. Due to the versatility of the regular expression it is widely used in text processing and parsing. Case-sensitivity. Regular Expression: (a+ba) * b* Accepted Strings (part of the language) The strings of length 1 = {b, a, no more string exist} The strings of length 2 = {bb, ba, ,…. You escape characters by using the backslash character ( \ ) in front of the character that would normally have a special meaning. log:)[^;]*' I know that there are matches because I created and tested my regex after this pattern. See the Change Log for links to prior stable versions. Because the -w option can match a substring that does not begin and end with word constituents, it differs from surrounding a regular expression with ‘\<’ and ‘\>’. So the uppercase or lowercase expression do not changes the behaviour of these comparison operators. Create a formal regular expressions that accepts all strings of 1 and 0 that do not contain 101 3 Finding the set of strings over {a, b} that do not contain the substring aaa. The filter appears in the view column. Once we list of words, we can insert them into HashSet. Regular expressions in sed are specified between two slashes. asp look like the design below: This can be achieved by adding the following lines in between the. A negative range characters. Because the -w option can match a substring that does not begin and end with word constituents, it differs from surrounding a regular expression with ‘\<’ and ‘\>’. 0, and it contains many bug fixes and some new features. – One non-finite VP in bold They do not want to try that. The following example prints the line if its in the range of 0 to 99999. It can be repeated; Use a Regex. Ksh Regular Expressions. If you find a modern regex engine where the pattern does not work, please let me know. x client software. Please be aware that this method sets the search to apply to the table only - it does not actually perform the search. To start, enter a regular expression and a test string. However, the PCRE syntax is mainly used. Here, for segmentation we have. For example, the following expression returns false: 'Blue Whale'. Regular expressions provide a unique way to search a volume of text for a particular subset of characters within that text. grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. Hint: use the (?i) embedded flag. x range) or 11. It's often when numbers mix with text that confusion occurs, and then you need a PowerShell script to solve the problem. In POSIX mode (see section Command-Line Options ), the fourth argument is not allowed. A remote attacker who persuades a user to open a specially crafted Microsoft Word Document containing SWF content could possibly execute arbitrary code in the context of the user. And if you need to match line break chars as well, use the DOT-ALL modifier (the trailing s in the following pattern):. If EXPR is omitted, returns the length of $_. The parse regex operator only supports regular expressions that contain at least one named capturing group. Is there a better way?. I tried to do the following thing: cat foo. By David Walsh on December 4, 2014. Pandas Series. You could use this type of code in other macros, to check a specific sheet for an AutoFilter. Description. Length of requests. Regular expressions (Regexp)is one of the advanced concept we require to write efficient shell scripts and for effective system administration. ) Any unused structure elements will contain the value -1. 7: Find a regular expression corresponding to the language of all strings over the alphabet { a, b } that do not end with ab. Also indicated with. 1 contain a denial of service (DoS) flaw in Timelion. test() JavaScript method. KeysValidator(required_keys=None, optional_keys=None, strict. Rhovas is a programming language for API design and enforcement. Pipelines - Pass objects down the pipeline. Square brackets can be used to indicate a set of chars, so [abc] matches 'a' or 'b' or 'c'. I am confused because a similar usage in the second sentence regex works fine. gastonsanchez. Regular expressions is a kind of programming language which is used to identify whether a pattern exists in a given sequence of characters (string) or not. Regular Expression to find. Please refer to the Regex Cheat Sheet on the left hand side. Java supports Regular expression on String and it's very powerful. 0 message code = 'blank' class pytoolbox. Variables - PowerShell Variables and basic Mathematical operators (+ - = /). Newline conventions Newline sequences affect where the ^ and$ anchors match and what \N and. Management, Administrative and Discovery Services: Learning Registry Technical Specification V MS:0. Agent Ransack has a "Specifies Not Expression" which will work for what you want, but you will need a regular expression match string in order to pull it off. So if you have only "OT " at the start of the line then you should use "^OT\s". Regular expression matches are most commonly used to match single strings, and we are talking about array comparisons—comparing one set of multiple values to another set of multiple values. Notice that in this regular expression, a negative lookahead and a dot are repeated together using a noncapturing group. whether the variables which are being used in setfact need to be set before using that in setfact, if so how to do that. The following regular expression matches for all Strings that contains word TEST, not matter if in the beginning or in the end:. IgnoreCase | RegexOptions. To check if string contains special character or not or check whether first character is special character or not we can use regex or contains method of sting class. For Regex patterns to match to request, keep the default selection of Create regex pattern set. Enter the first regular expression Jack|John. Getting Started. For example, they may not allow you to split a string constant using backslash continuation. If no package matches the given expression and the expression contains one of ". The following tables describe the elements of regular expressions. In simple terms regular expressions are a clever way to find text. 4 by introducing java. Perl is a great example of a programming language that utilizes regular expressions. Long regular expression patterns may or may not be accepted: the POSIX standard only requires up to 256 bytes. The code provides methods to validate Alphabet, AlphaNumeric, Integer, Positive Integers, Floating point numbers and so on. In case you are curious about the source, willing to contribute, or you just want to do it yourself, feel free to see our GitHubproject page After you have installed the package, it’s time for conﬁguration 1. Metacharacters. Short for regular expression, a regex is a string of text that allows you to create patterns that help match, locate, and manage text. I spend my professional life caring hugely how things look but not here. match_not_eow: Not End-Of-Word: The escape sequence "\b" does not match as an end-of-word. Python\w+) … But it is much tidier. The following two pattern matches are equivalent in the sense that each one succeeds only for strings that contain a b character, but the first is more efficient because the pattern is simpler: 'abc' REGEXP 'b' 'abc' REGEXP '^. Use a regular expression to find records. \B | Matches where \b does not, that is, the boundary of \w characters. regex package. -d--delim=regex: Use regex as the number delimiter. This code does the same thing as version 1. Your screenshot should contain a typical scene when working with it. String class to do that, this method returns an array of words. Enter a regular expression. The ClassIndex provides access to information stored in the persistent index. Only when the hex dump data differs, will it be detected by the diff tool. If modified by the Singleline option, a period character matches any character. 0 BETA is now available. “I skate to where the puck is going to be, not where it has been” ~ Wayne Gretsky. At first we use regular expression and the replace() method to clear out any spacer characters. The 'ignorecase' option does not do this. Please refer to the Regex Cheat Sheet on the left hand side. By using java. This means the conversion process can be implemented. "matches" means that the regular expression matched the whole target. it (same thing, but appears to time out more frequently) Discord As an experimental language, there's a number. REGEXP_REPLACE - Similar to REPLACE except it uses a regular expression as the search string. For someone familiar with regular expressions, especially as they are implemented in. Regular expressions are used when you want to search for specific lines of text containing a particular pattern. Don’t think too much! Of course. × Members Get More! Sign up for free and gain access to 3,265 member-only definitions of English idioms and slang expressions. Learn about Salesforce Apex, the strongly typed, object-oriented, multitenant-aware programming language. Registered User. JavaScript Regex: String Does Not Contain Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. txt which contains the following text: one two three four five alpha beta gamma delta epsilon. In this case, the regular expression assumes that a valid currency string does not contain group separator symbols, and that it has either no fractional digits or the number of fractional digits defined by the current culture's CurrencyDecimalDigits property. Disable and enable a dropdown list Get the id of the form that contains the dropdown list Get the number of options in the dropdown list Turn the dropdown list into a. REGEXP_REPLACE - Similar to REPLACE except it uses a regular expression as the search string. A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that define a search pattern. Thus, for maximum portability of your awk programs, it is best not to split your lines in the middle of a regular expression or a string. Q$Q1Q$ R4,R/aRR$JS oS S6S1S1 T!JT. The list must not contain duplicate elements. Simplified Chinese: Ansible Tower 快速入门指南 v3. match_continuous: Continuous. Replace method, which replaces all matches defined by a regular expression with a replacement string. 1; Simplified Chinese: Ansible Tower 安装和参考指南 v3. Escape converts a string so that the regular expression engine will interpret any metacharacters that it may contain as character literals. java to make the searches case insensitive. A framework for building web apps and services with. example: to find all lines which do not contain the string "pluto once was a planet" select regular expression as search mode in the notepad++ find or replace window. Regular expressions are used by several different Unix commands, including ed, sed, awk, grep, and to a more limited extent, vi. This value is used to extract numbers from each line of the input. If you are trying to solve a problem with regular expressions… you now have two problems. learnpython. Because PowerShell is new, detailed documentation and examples are harder to find than for. The following command prints lines containing the word ‘hello’:. The function below checks if the phone number is valid. This method lets you determine whether or not a string includes another string. Closed, Resolved Public 2 Estimate Story Points. "matches" means that the regular expression matched the whole target. For whatever reason, GA no longer supports positive and negative outlooks. ing$ matches "exciting" but not "ingenious" See also: Regular Expression Character Classes CheatSheet. Apex syntax looks like Java and acts like database stored procedures. ' in the address. Regular expressions can contain both special and ordinary characters. This is necessary to ensure that the regex ‹ \berror\b › fails at every position in the line. hidden-file bash$ls -l total 10 -rw-r--r-- 1 bozo 4034 Jul 18 22:04 data1. acl aclname req_header header-name [-i] any\. × Members Get More! Sign up for free and gain access to 3,265 member-only definitions of English idioms and slang expressions. It is usually a text literal and can be of any of the datatypes CHAR, VARCHAR2, NCHAR, or NVARCHAR2. Must contain at least 1 upper case letter. All database professionals should know how to write, troubleshoot, and optimize SQL. I recommend that you break out the steps of this process such as 1) determine if the condition exists and if it does do what needs to be done with a separate regex(?), otherwise match what needs to be matched in a specific regex for that condition. Whenever a match is found and a regex group is used; (), the [regex] type accelerator has a Captures property. Write a regular expression to check for the sequence rGATCy: that is, does it start with A or G, then GATC, and then T or C. A regular expression can contain multiple alternative patterns simply by separating them with the separator operator (|): The regular expression will match if any of the alternatives match, and as soon as one does. Often the best way to separate words in a C# string is to use a Regex that acts upon non-word chars. tags of the Default. Regular expressions come in handy for all varieties of text processing, but are often misunderstood--even by veteran developers. 0, and it contains many bug fixes and some new features. Put here the regular expression to match. JavaScript Regex: String Does Not Contain. So to say: REGULAR EXPRESSION = does not contain "string". java to make the searches case insensitive. For this kind of scenario, there is another method that provides much better performance—a regular expression (regex) match. Java regex is the official Java regular expression API. So, 'input damian whatever' is a match, while 'input damian type whatever' is not. SELECT * FROM [table name] WHERE rec RLIKE "^a$"; Show unique records. a finite state automata given a regular expression, and an algorithm is given that derives the regular expression given a finite state automata. pytoolbox Documentation, Release 13. match_continuous: Continuous. Use variable substitution. Browse other questions tagged grep regular-expression pipe or ask your own question. When you search for a text string that contains special regex symbols, IntelliJ IDEA automatically escapes them with backlash \ in the search field. # -*- coding: utf-8 -*- ### Python library ##### Functions and structures ### #import Stack, VideoFiles, fnmatch ### Plex Media Server\Plug-ins\Scanners. For example, they may not allow you to split a string constant using backslash continuation. any alphanumeric character: a-zA-Z0-9; the hyphen -, if it’s not the first or last character. 'erB' matches the 'er' in "verb" but not the 'er' in "never". The values of m and n must be non-negative and smaller than 255. length EXPR. IgnoreCase); private static readonly Regex rxDtd = new Regex(@"", RegexOptions. Globalization; using System. If EXPR is omitted, returns the length of $_. Compiled); public MainFrm(string cmdNotebook. I want Regular Expression for language L defined over {a,b} and L does not contain substring 'bbb'. *bee$ The negative look ahead will ensure that the expression will not match if the phrase contains "like". Below is a table of symbols that can be used from Google’s official support. This means the conversion process can be implemented. 0, and it contains many bug fixes and some new features. Abap Style; Algol Style; Algol_Nu Style; Arduino Style; Autumn Style; Borland Style; BlackWhite Style; Colorful Style; Default Style; Emacs Style; Friendly. x 7(J')J:QJnJ;J 7K_PK%KJKJ!L$lL%LyL|1MM={N&N N!O. Therefore, implementing awk regexes as find does, would not imply that should match. Version 2: Uses Regex. Apex syntax looks like Java and acts like database stored procedures. Although the previous regular expression is perfectly fine for telling us when we are parsing a date, it does not help when it comes to separating out the date, month, and year data components of the string. Use a regular expression to find records. You should make yourself familiar with regex usage and do some testing with these regex expressions. Tests that the named array element contains all of the values (see$all). The *in* construct on its own is an easy way to test if an element appears in a list (or other collection) -- value in collection -- tests if the value is in the collection, returning True/False. Variables - PowerShell Variables and basic Mathematical operators (+ - = /). Its name comes from the ed command g/re/p (globally search for a regular expression and print matching lines), which has the same effect. So to say: REGULAR EXPRESSION = does not contain "string". Disable and enable a dropdown list Get the id of the form that contains the dropdown list Get the number of options in the dropdown list Turn the dropdown list into a. here # regex match against any of the known request headers. File size limit: 20 mb Valid file types: JPG/JPEG, TIFF, GIF, PNG, PSD, BMP, RAW, CR2, CRW, PICT, XMP, DNG. SQL Tutorial. Windows PowerShell Regex - Regular Expressions. contains() function is used to test if pattern or regex is contained within a string of a Series or Index. Positions start with 1. ([^1] | (1[^1])*)* or simply ([^1] | 1[^1])* I arrived at this regular expression by first building a DFA for L= all strings that contain 11 as a substring. JSONLint is the free online validator and reformatter tool for JSON, a lightweight data-interchange format. Both of the following examples do the same thing in different ways (consider SRC_PATH and DEST_PATH are directories):. That means check OT and space at the beginning of line only. The Java regex API is located in the java. Regex matches are useful when the stem, trailing parameters, or both, can vary in the URLs for the same webpage. It matches them in the order and case in which they are written. Following regular expression can be used to check if a String contains only number or not. The backslash is used as an escape character in regular expressions. txt which contains the following text: one two three four five alpha beta gamma delta epsilon. Must contain at least 1 upper case letter. Regex Match 17. This seems a little harsh for a useful tool that has been with us for what seems a very long time. PHP Regular Expression Functions. ES6 features. Now what if you'd like to know what the string that was matched? To do this, we'll use regex groups. Click on a link, and a DHTML calendar drops down, allowing the user to click the desired date to enter into form element. The list must not contain duplicate elements. I do not know why, but it seems that the !~ operator does not work for text. Significant d. The Java regex API is located in the java. The password also can not start with a digit, underscore or special character and must contain at least one digit. For Regex patterns to match to request, keep the default selection of Create regex pattern set. For example, they may not allow you to split a string constant using backslash continuation. Any help would be appreciated. Due to the versatility of the regular expression it is widely used in text processing and parsing. You say that you "have a file containing a list of all words of a language" and you "would like to find all words containing some letters (in any order). -isplit and -csplit are the variants on this command. js command-line application for quickly creating all release files. January 24, 2015 - JFLAP 8. It also shows how to find which version of V8 shipped with a particular Node. ) Any unused structure elements will contain the value -1. If you're still leaning on grep and sed commands to get your scripts to do what you need from them. 0 GitHub Vulnerability Alerts CVE-2017-16026 Affected versions of request. To check if string contains special character or not or check whether first character is special character or not we can use regex or contains method of sting class. Notice that in this regular expression, a negative lookahead and a dot are repeated together using a noncapturing group. You could use this regular expression (which uses a negative lookahead): (?!. Closed, Resolved Public 2 Estimate Story Points. I have tried escaping it as \\& and also used \x26 but it does not seem to work. This regular expression can be used to validate a strong password. Square brackets can be used to indicate a set of chars, so [abc] matches 'a' or 'b' or 'c'. aspx design markup:. Here: This example separates words in a string based on non-word characters. Regular expressions come in handy for all varieties of text processing, but are often misunderstood--even by veteran developers. The simplest solution to match any line that ends in 'og' but is not 'bog' would be the expression [^b]og. true if the search string is found anywhere within the given string; otherwise, false if not. Please advise. {"widget": { "debug": "on", "window": { "title": "Sample Konfabulator Widget", "name": "main_window", "width": 500, "height": 500 }, "image": { "src": "Images/Sun. do not match. Alternatively, you could use what we learned from the previous lesson and use [hd]og to match 'hog' and 'dog' but not 'bog'. This is a work in progress - Questions, comments, criticism, or requests can be directed Here. Examples: IF EXIST C:\logs\*. With RegEx you can use pattern matching to search for particular strings of characters rather than constructing multiple, literal search queries. 01 release - Fix anti ids encoding use. and many more similar strings. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. NET or Perl. Wednesday, 6 November 2019. If string does not match fieldsep at all (but is not null), array has one element only. * worked fine. RegularExpressions; public class Example { public static void Main. learnpython. In the following construction I start with a DFA for $\overline{101}$ which I then convert to a DFA and then into a sequence of GNFA's. [aeiou] Matches any single character included in the specified set of characters. "contains" means that the regular expression matched at least some part of the target, so ' alphabet ' "contains" ' ph. So the uppercase or lowercase expression do not changes the behaviour of these comparison operators. Get Started Download. Regular expressions (global) does not return after the first match, find all pages that contain a certain set of words eventually in a specific order). If you find a modern regex engine where the pattern does not work, please let me know. If the datatype of pattern is different from the datatype of source_char, Oracle converts pattern to the datatype of source_char. This is an odd package, it uses the same api as the postcss plugin, but it doesn't do what a traditional plugin should do, which is to transform the css in someway. Your screenshot should contain a typical scene when working with it. Can someone assist with writing the regex for: does not contain (Phrase here) ? I am trying to do a vulnerability text does not contain a certain exe file on plugin 44401. RegExp Object. I'm stuck on trying to figure out the DFA. Agent Ransack has a "Specifies Not Expression" which will work for what you want, but you will need a regular expression match string in order to pull it off. For example, the following expression returns false: 'Blue Whale'. Add two numbers using x and y variable. I need two regular expression one for allowing more number of characters in a sentence as below which is working fine. kotlin kotlin-stdlib 1. aspx design markup:. Regular expression matches are most commonly used to match single strings, and we are talking about array comparisons—comparing one set of multiple values to another set of multiple values. go api tools faq deals. Your Task is really challenging. Most of the UNIX utilities operate on ASCII files a line at a time. So ' alphabet ' is "matched" by ' al. If the datatype of pattern is different from the datatype of source_char, Oracle converts pattern to the datatype of source_char. IsMatch directly with no stored Regex instance. Snort is an open-source, free and lightweight network intrusion detection system (NIDS) software for Linux and Windows to detect emerging threats. REGEXP_SUBSTR - Returns the string matching the regular expression. py may help when updating unicode_codes. Extended Regular Expressions This section covers the regular expressions allowed in the default mode of grep , grepl , regexpr , gregexpr , sub , gsub , regexec and strsplit. This function cannot be used on an entire array or hash to find out how many elements these have. Use this option together with --max=number to draw the input in real time. Regular Expression Strings does not contain substring bba. These are encoded in the pattern by the use of special characters, which do not stand for themselves but instead are interpreted in some special way. )*$[/code]You can test it here. --generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. regex package which has been part of standard Java (JSE) since Java 1. match_any: Any match: Any match is acceptable if more than one match is possible. In POSIX mode (see section Command-Line Options ), the fourth argument is not allowed. For example, let's say you have a file named data. the split method returns an array containing the tokens (as strings. Because the -w option can match a substring that does not begin and end with word constituents, it differs from surrounding a regular expression with ‘\<’ and ‘\>’. [code]^((?!1101). “I skate to where the puck is going to be, not where it has been” ~ Wayne Gretsky. Character classes. #include Public Member Functions GetIntegrationResponseResult(). acl aclname req_header header-name [-i] any\. In addition, it can contain any ASCII character from the !. The filename is generated by taking pattern and adding a random string to the end. For example, if we want to find all the lines not containing the word 'foo', do: /^$$\(. In the following example I am using the. Call a regular expression star-free if it does not contain any star operations. * How would the regular expression look like that matches for all Strings that do not contain the word TEST? For testing I am using the following code:. WHERE “First 3 Letters” “Is not equal to” “USA” Easy as that! You can use this method to create a view for: Does not begin with; Does not end with (using the RIGHT instead of LEFT function) “Does not contain” is a tad more complicated but can be achieved by using the SEARCH function. Generally speaking it scrapes a table on the Unicode Consortium’s website with BeautifulSoup and prints the contents to stdout in a more useful format. Because PowerShell is new, detailed documentation and examples are harder to find than for. not match if the string does not contains a comma. first you need to do to check that is your src value contain the whole url or only the partial url to do that you need split the string with " " blank space or another way is by looping asn checking each and evrer character. Welcome to the MojoHaus Project (previously known as [email protected]) The MojoHaus project is a collection of plugins for Apache Maven 2 & 3. In this case, the regular expression assumes that a valid currency string does not contain group separator symbols, and that it has either no fractional digits or the number of fractional digits defined by the current culture's CurrencyDecimalDigits property. Following regular expression can be used to check if a String contains only number or not. We have discussed several tasks in the JavaScript using the regular expression (Use of regular expression in javascript). java to make the searches case insensitive. and many more similar strings. (3) to do complex replacement in a text. *like)^sting. You should make yourself familiar with regex usage and do some testing with these regex expressions. Positions start with 1. We probably already have it as a dependency of our project: org. Probably the most known use of regular expressions are in the programming language Perl. x range) or 11. For example, they may not allow you to split a string constant using backslash continuation. In particular, this means that character classes do not contain meta characters which need to be escaped, except the - and ] character, where it is assumed that a -` needs not to be escaped only when it is the last. Put here the regular expression to match. 10) or later use scripting additions set nameArray to {} set templateFolder to (alias "Macintosh HD:Users:jsnell:Dropbox:Podcast Templates:") tell application "Finder" to set theNames to the name of items in folder templateFolder set mychoice to (choose from list. Not really similar to SUBSTR. online casino osterreich roulette : I realise that a Web2 version of this tool would look great but I don't care. This stream-oriented editor was created exclusively for executing scripts. Metacharacters. FINDSTR does not support alternation with the pipe character (|) multiple Regular Expressions can be separated with spaces, just the same as separating multiple words (assuming you have not specified a literal search with /C) but this might not be useful if the regex itself contains spaces. This is a more advanced technique that might not be available in all regex implementations. The configuration files contain most of the default configurations that are available for the Beat. RegEx to tell if a string does not contain a specific character. For example, consider a. Java supports Regular expression on String and it's very powerful. Keep these two rules in mind: Maximum length of 128 characters. A regular expression is a way to match patterns in data using placeholder characters, called operators. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. RegExp Object. lT T*T T T T) U96U. js command-line application for quickly creating all release files. Thus, for maximum portability of your awk programs, it is best not to split your lines in the middle of a regular expression or a string. If you're still leaning on grep and sed commands to get your scripts to do what you need from them. Hint: use the (?i) embedded flag. In the above example, this would match "dall," "dell," "dill," "doll," and "dull" since they contain a "d" at the first and "ll" at the end. Regular expressions are extremely useful for matching. D: Matches a non-digit character. JSONLint is the free online validator and reformatter tool for JSON, a lightweight data-interchange format. The question mark only matches one character. Regular expressions (and Perl itself, for that matter) really start earning their keep by allowing you to select and process substrings based on what they contain, and the context in which they appear. Use an * for any string. First, add translation_manager to INSTALLED_APPS to your project’s settings in settings. 0 message code = 'blank' class pytoolbox. whitespace are ignored. Oracle 11g introduced two new features related to regular expressions. Computers can only understand numbers, so an ASCII code is the numerical representation of a character such as 'a' or '@' or an action of some sort. 0 GitHub Vulnerability Alerts CVE-2017-16026 Affected versions of request. If the pattern does not contain any parenthesized subexpressions, then the result is a single-element text array containing the substring matching the whole pattern. It can be used to obtain list of packages or declared types. compile() method to compile a regular expression: copy. Regular expressions provide a unique way to search a volume of text for a particular subset of characters within that text. Python does not have a separate character type. We recommend you do the same. The regex above will match any string, or line without a line break, not containing the (sub)string ‘hede’. Your screenshot need to be approved by the moderators first. Start by entering a regular expression and then a test string. Description. REGEXP_SUBSTR - Returns the string matching the regular expression. If you want to match a space in a verbose regular expression, you'll need to escape it by escaping it with a backslash in front of it or include it in a character class. Hello JcNet. Uses very basic regular expressions, so will fail with strings that contain ;s, and does not support Unicode. , if it’s not the first or last character. Will match the url of the page exactly. Does your form contain INPUT box(es) that require a date value from the visitor? Sev's Popup Calendar script allows for a visual, interactive way of selecting and inputting this date. Regular expressions in sed are specified between two slashes. IgnoreCase | RegexOptions. What specific. "contains" means that the regular expression matched at least some part of the target, so ' alphabet ' "contains" ' ph. Your screenshot should contain a typical scene when working with it. Add tests for braille routing commands, fix chromevox and reenable background tests. Any non-trivial regex looks daunting to anybody not familiar with them. using System; using System. Findstr command on Windows is useful for searching for specific text pattern in files. ), multiply (*), back slash ($$ have special meaning. Later, we'll see how to use "lookahead" and "lookbehind" to search for the absence of more complex patterns. This is why it is important to remember what commands use regex. Regular expressions can contain both special and ordinary characters. This is a more advanced technique that might not be available in all regex implementations. * The search type for “Regular expression” appears next as lParam=“2” in the 1625 message. Split() Like with the replace command, there is a String. 01 release - Fix anti ids encoding use. A portal to gene-specific content based on NCBI's RefSeq project, information from model organism databases, and links to other resources. Breaks up a string into an array of substrings based on a regular expression or fixed string. Their syntax is similar to Perl regular expressions. Your screenshot need to be approved by the moderators first. \A | Matches the expression to its right at the absolute start of a string whether in single or multi-line mode. Determines whether the regular expression expr matches part or all of string. Getting Started. It is usually a text literal and can be of any of the datatypes CHAR, VARCHAR2, NCHAR, or NVARCHAR2. Tip: The Regex method allows you to replace variations in the string in one statement. At first we use regular expression and the replace() method to clear out any spacer characters. Square Brackets. If dir is the empty string, TempFile uses the default directory for temporary files (see os. 4 Gelatin turns your text soup into something solid. Acknowledgement sent to Scott Leggett : New Bug report received and forwarded. The configuration files contain most of the default configurations that are available for the Beat. If pattern includes a "*", the random string replaces the last "*". A glob pattern is a word containing one or more unquoted ‘?’ or ‘*’ characters, or “[. Match string not containing string Given a list of strings (words or other characters), only return the strings that do not match. I want Regular Expression for language L defined over {a,b} and L does not contain substring 'bbb'. Management, Administrative and Discovery Services: Learning Registry Technical Specification V MS:0. Enter the first regular expression Jack|John. 2Conﬁguratuion 1. Character classes. It will save you lots of guesswork and head scratching when you need to write more complex regexes. 'erB' matches the 'er' in "verb" but not the 'er' in "never". With that string-length-1, the operators ==, =, all work as you would expect, so mostly you don't need to know that Python does not have a separate scalar "char" type. Keep these two rules in mind: Maximum length of 128 characters. However, my name regex is failing with the &. contains(pat, case=True, flags=0, na=nan, regex=True) Parameter :. Regular expressions in Calc and Writer. You say that you "have a file containing a list of all words of a language" and you "would like to find all words containing some letters (in any order). Compilers/polyfills Desktop browsers Servers/runtimes Mobile; Feature name Current browser ES6 Trans-piler Traceur Babel 6 + core-js 2 Babel 7 + core-js 2. So, 'input damian whatever' is a match, while 'input damian type whatever' is not. At first we use regular expression and the replace() method to clear out any spacer characters. The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. 0 BETA is now available. Therefore, implementing awk regexes as find does, would not imply that should match. Extended Regular Expressions This section covers the regular expressions allowed in the default mode of grep , grepl , regexpr , gregexpr , sub , gsub , regexec and strsplit. String must contain a number, an Uppercase letter and a Lower case letter. ASCII Table and Description. You need to incorporate all logics in there or you can break up the logic to meet your need. "contains" means that the regular expression matched at least some part of the target, so ' alphabet ' "contains" ' ph. Regex matches are useful when the stem, trailing parameters, or both, can vary in the URLs for the same webpage. The shortest way I know is go through DFA. What specific. Python does not have a separate character type. Examples of regular expression syntax are given later in this chapter. *" matches "how-lo" and "lowest". Toggle navigation. The source code for check_http. it is accepting only "my1pass" or "1mypass". It works differently, but you can use regular expressions in Google Analytics API queries: Image courtesy You can also use regular expressions in filter expressions using the =~ and !~ operators. A negative range characters. Tests that the value of the named element has all of the specified bits clear. Basically, what Im looking to do is match all pages starting with /default which includes NewInventory but does not contain Detail. ing$ matches "exciting" but not "ingenious" See also: Regular Expression Character Classes CheatSheet. Please advise. For Regex patterns to match to request, keep the default selection of Create regex pattern set. example: to find all lines which do not contain the string "pluto once was a planet" select regular expression as search mode in the notepad++ find or replace window. Regular expressions come in handy for all varieties of text processing, but are often misunderstood--even by veteran developers. The power of regular expressions comes from the ability to include alternatives and repetitions in the pattern. If no package matches the given expression and the expression contains one of ". Regular expressions in Calc and Writer. Write a regular expression to check for the sequence rGATCy: that is, does it start with A or G, then GATC, and then T or C. For more information about the native functions for PHP regular expressions, have a look at the manual. Notice that in this regular expression, a negative lookahead and a dot are repeated together using a noncapturing group. The includes() method is case sensitive. --Must contain at least one @ and one. IsMatch directly with no stored Regex instance. See full list on powershellexplained. f can be fetched by: ?44. In order to match a line that does not contain something, use negative lookahead (described in Recipe 2. Apex syntax looks like Java and acts like database stored procedures. The “if” statement, tests a string by using “regex” or regular expression and starts with “^”. Regular expressions in sed are specified between two slashes. contains(pat, case=True, flags=0, na=nan, regex=True) Parameter :. Regular expression: Require text answers to match certain formulas that you choose. Python RegEx or Regular Expression is the sequence of characters that forms the search pattern. Excel does not natively provide any Regex functions which often requires creating complex formulas for extracting pieces of strings otherwise easy to extract using Regular Expressions. Any non-trivial regex looks daunting to anybody not familiar with them. @Peter-Cohen yes, you can find and/or replace any lines/records which do not contain a certain string using regular expressions. JavaScript Regex: String Does Not Contain. ES6 features. instance must be a positive number. Regex E: (?-is)^(?!^. Also the -E param worked because the regex *. Regular Expression to Given a list of strings (words or other characters), only return the strings that do not match. Computers can only understand numbers, so an ASCII code is the numerical representation of a character such as 'a' or '@' or an action of some sort. Acknowledgement sent to Scott Leggett : New Bug report received and forwarded. You say that you "have a file containing a list of all words of a language" and you "would like to find all words containing some letters (in any order). Does your form contain INPUT box(es) that require a date value from the visitor? Sev's Popup Calendar script allows for a visual, interactive way of selecting and inputting this date. A brief explanation of the format of regular expressions follows. In python, it is implemented in the re module. This Captures property then has a property called Groups. Ksh has it's own regular expressions. A framework for building web apps and services with. \)*\$ Here is an example: When examining a log file, you might only be interested in lines not containing the word "Warning", so the search command is: /^\(. So the uppercase or lowercase expression do not changes the behaviour of these comparison operators.


text:
# Size of an object (the space it occupies in your whole field of vision) as you move away from it

I'm not sure if this is the right forum for this question, and it must be already answered somewhere so you can just point me to the answer.

If there is a disc of radius $$r$$ and an observer is moving away from it at a constant speed while staying "aligned" with the center (on an orthogonal line that passes through the center), how does the ratio $$\frac{\text{area of the disc}}{\text{total area of visible things in the plane of the disc}}$$ evolve?

Let's say the observer can see anything that doesn't require him to move his eyeball (he's a cyclope w.l.o.g) by more than a certain angle $$\theta\in (0,\pi)$$. Let's call $$L$$ the distance between the eye and the center of the disc. If $$L=\frac{r}{\tan\theta}$$ then the ratio occupies all of the visible area and our ratio is $$1$$.

I found that the ratio is $$\frac{\pi r^2}{\pi (L\tan\theta)^2}=\frac{r^2}{L^2\tan^2\theta}$$ so the evolution of the space taken by the disc in the field of vision is $$\frac{\partial}{\partial L} \frac{r^2}{L^2\tan^2\theta}=\frac{r^2}{\tan^2\theta}\frac{-2}{L^3}$$ does that make sense?

format: plain


text:
## Seminars and Colloquia by Series

Series: PDE Seminar
Wednesday, February 18, 2015 - 11:05 , Location: Skiles 170 (Special) , Wang, Yaguang , Shanghai Jiaotong University , Organizer:
In this talk, we shall study the stability of the Prandtl boundary layer equations in three space variables. First, we obtain a well-posedness result of the three-dimensional Prandtl equations under some constraint on its flow structure. It reveals that the classical Burgers equation plays an important role in determining this type of flow with special structure, that avoids the appearance of the complicated secondary flow in the three-dimensional Prandtl boundary layers. Second, we give an instability criterion for the Prandtl equations in three space variables. Both of linear and nonlinear stability are considered. This criterion shows that the monotonic shear flow is linearly stable for the three dimensional Prandtl equations if and only if the tangential velocity field direction is invariant with respect to the normal variable, which is an exact complement to the above well-posedness result for a special flow. This is a joint work with Chengjie Liu and Tong Yang.
Series: PDE Seminar
Tuesday, February 17, 2015 - 15:05 , Location: Skiles 006 , Robin Young , University of Massachusetts, Amherst , Organizer:
Series: PDE Seminar
Tuesday, January 27, 2015 - 15:05 , Location: Skiles 006 , Jeremy Marzuola , University of North Carolina at Chapel Hill , Organizer:
We survey some recent results by the speaker, Jason Metcalfe and Daniel Tataru for small data local well-posedness of quasilinear Schrödinger equations. In addition, we will discuss some applications recently explored with Jianfeng Lu and recent progress towards the large data short time problem.  Along the way, we will attempt to motivate analysis of the problem with connections to problems from Density Functional Theory.
Series: PDE Seminar
Tuesday, January 13, 2015 - 15:05 , Location: Skiles 006 , Konstantina Trivisa , University of Maryland , Organizer:
A class of kinetic models for the collective self-organization of agents is presented. Results on the global existence of weak solutions as well as a hydrodynamic limit will be discussed. The main tools employed in the analysis are the velocity averaging lemma and the relative entropy method. This is joint work with T. Karper and A. Mellet.
Series: PDE Seminar
Tuesday, December 9, 2014 - 15:05 , Location: Skiles 006 , Geng Chen , Georgia Tech , Organizer:
The existence of large BV (total variation) solution for compressible Euler equations in one space dimension is a major open problem in the hyperbolic conservation laws, where the small BV existence was first established by James Glimm in his celebrated paper in 1964. In this talk, I will discuss the recent progress toward this longstanding open problem joint with my collaborators. The singularity (shock) formation and behaviors of large data solutions will also be discussed.
Series: PDE Seminar
Tuesday, December 2, 2014 - 15:00 , Location: Skiles 006 , Pierre Germain , Courant Institute , Organizer:
Abstract: the theory of weak turbulence has been put forward by appliedmathematicians to describe the asymptotic behavior of NLS set on a compactdomain - as well as many other infinite dimensional Hamiltonian systems.It is believed to be valid in a statistical sense, in the weaklynonlinear, infinite volume limit. I will present how these limits can betaken rigorously, and give rise to new equations.
Series: PDE Seminar
Tuesday, November 25, 2014 - 15:05 , Location: Skiles 006 , Changyou Wang , Purdue University , Organizer:
For a $C^{1,1}$-uniformly elliptic matrix $A$, let $H(x,p)=$ be the corresponding Hamiltonian function. Consider the Aronsson equation associated with $H$: $$(H(x,Du))x H_p(x,Du)=0.$$ In this talk, I will indicate everywhere differentiability of any viscosity solution of the above Aronsson's equation. This extends an important theorem by Evans and Smart on the infinity harmonic functions (i.e. $A$ is the identity matrix).
Series: PDE Seminar
Tuesday, November 4, 2014 - 15:00 , Location: Skiles 006 , Michael Shearer , North Carolina State University , Organizer:
Shock waves are idealizations of steep spatial gradients of physical quantities such as pressure and density in a gas, or stress in an elastic solid. In this talk, I outline the mathematics of shock waves for nonlinear partial differential equations  that are simple models of physical systems. I will focus on non-classical shocks and smooth waves that they approximate. Of particular interest are comparisons between nonlinear traveling waves influenced strongly by dissipative effects such as viscosity or surface tension, and spreading waves generated by the balance between dispersion and nonlinearity, when the nonlinearity is non-convex.
Series: PDE Seminar
Tuesday, October 28, 2014 - 15:05 , Location: Skiles 006 , Albert Fathi , École Normale Supérieure de Lyon, France , Organizer:
In this lecture, we will explain a new method to show that regularity on the boundary of a domain implies regularity in the inside for PDE's of the Hamilton-Jacobi type.  The method can be applied in different settings. One of these settings concerns continuous viscosity solutions $U : T^N\times [0,+\infty[ \rightarrow R$ of the evolutionary equation $\partial_t U(x, t) + H(x, \partial_x U(x, t) ) = 0,$ where $T^N = R^N / Z^N$, and $H: T^N \times R^N$ is a Tonelli Hamiltonian, i.e. H(x, p) is $C^2$, strictly convex superlinear in p.  Let D be a compact smooth domain with boundary $\partial D$ contained in $T^N \times ]0,+\infty[$ . We show that if U is differentiable at each point of $\partial D$, then this is also the case on the interior of D.  There are several variants of this result in different settings.  To make the result accessible to the layman, we will explain the method on the function distance to a closed subset of an Euclidean space. This example contains all the ideas of the general case.
Series: PDE Seminar
Tuesday, October 7, 2014 - 15:00 , Location: Skiles 006 , Xuwen Chen , Brown University , Organizer:
We consider the focusing 3D quantum many-body dynamic which models a dilute bose gas strongly confined in two spatial directions. We assume that the microscopic pair interaction is focusing and matches the Gross-Pitaevskii scaling condition. We carefully examine the effects of the fine interplay between the strength of the confining potential and the number of particles on the 3D N-body dynamic. We overcome the difficulties generated by the attractive interaction in 3D and establish new focusing energy estimates. We study the corresponding BBGKY hierarchy which contains a diverging coefficient as the strength of the confining potential tends to infinity. We prove that the limiting structure of the density matrices counterbalances this diverging coefficient. We establish the convergence of the BBGKY sequence and hence the propagation of chaos for the focusing quantum many-body system. We derive rigorously the 1D focusing cubic NLS as the mean-field limit of this 3D focusing quantum many-body dynamic and obtain the exact 3D to 1D coupling constant.


text:
# Define a function f such that f(f(n)) = -n for all non-zero integers n

This challenge was inspired by a programming blog I frequent. Please see the original post here: A Programming Puzzle

# Challenge

Define a function f:Q->Q such that f(f(n)) = -n for all non-zero integers n, and whereQ is the set of rational numbers.

# Details

In whatever language you prefer, please define one function or program f that accepts as parameter one number n and returns or outputs one number f(n).

Input may be provided through whichever mechanism is most natural for your language: function argument, read from STDIN, command-line argument, stack position, voice input, gang signs, etc.

Output should be a return value from a function/program or printed to STDOUT.

I would like to restrict answers to functions that do not take advantage of program state or global memory/data that is visible from outside of the function f. For example, keeping a counter outside of f that counts how many times f was called and just doing a negation based on this count isn't very challenging or interesting for anyone. The decisions f makes should rely only on data within f's lexical scope.

However, this restriction is probably inappropriate for some stack-oriented languages or other types of languages that do not distinguish these types of data or scopes. Please use your best judgement to keep with the spirit of this challenge.

# Scoring

Common code golf rules apply- your score is the number of bytes in your source code.

The minimal answer requires the domain and codomain of f to be a subset of the rationals Q. If you restrict your domain and codomain of f to the integers Z, then your score is the ceiling of 90% of the number of bytes in your source code.

# Tiebreak

In the event of a tie, the following will be used in order:

1. Fewest number of printable non-whitespace symbols in your source code
2. Earliest date and time of answer submission

### Edit

You are not required to support arbitrarily sized numbers. Please interpret the sets Z and Q as datatypes in your chosen language (typically integer and floating point, respectively).

If your solution relies entirely on the underlying structure or bit pattern of a data type, please describe its limitations and how it is being used.

• f(n) = i*n -- pure math :P – Johannes Kuhn Jun 29 '13 at 17:33
• @JohannesKuhn this is why the domain and codomain are restricted to the rationals – ardnew Jun 29 '13 at 17:36
• Could you explain what f:Q->Q means? – beary605 Jun 29 '13 at 17:38
• @beary605 it means f is a function mapping members of Q (rational numbers) to other members (possibly the same) of Q. see en.wikipedia.org/wiki/Function_(mathematics)#Notation – ardnew Jun 29 '13 at 17:41
• I knew I'd seen this recently, but it took a while to remember where. A less tightly specified version on StackOverflow was recently closed. Over 100 answers. – Peter Taylor Jun 29 '13 at 19:36

# Forth, 37 bytes

: f 9 @ if negate 0 else 1 then 9 ! ;

Works at least in durexforth (it should at least, I couldn't type the whole line in because VICE was being stupid with my keybaord layout so I couldn't type the :). To run it in gforth you need to do variable 9 before, since it doesn't allow writing to arbitrary memory locations.

(Forth sadly doesn't work with floating point numbers.)

C, 80 bytes

#include <math.h>
double z(double x){return x==0.0?x:fabs(x)>0.5?0.5/x:-0.5/x;}

for to test

#include <stdio.h>
#define P printf
#define R return
main()
{double i, j;
for(i=-20;i<20;i+=1)
P("z(z(%f))=%f\n", i, z(z(i)) );
for(i=-2;i<-1;i+=0.1)
P("z(z(%f))=%f\n", i, z(z(i)) );
for(i= 2;i<3;i+=0.1)
P("z(z(%f))=%f\n", i, z(z(i)) );
P("z(z(%f))=%f\n", 0.1245447, z(z(0.1245447)) );
R 0;
}

results where you can see that this is for every number in double except 0 and 2 other

/*
z(z(-20.000000))=20.000000
z(z(-19.000000))=19.000000
z(z(-18.000000))=18.000000
z(z(-17.000000))=17.000000
z(z(-16.000000))=16.000000
z(z(-15.000000))=15.000000
z(z(-14.000000))=14.000000
z(z(-13.000000))=13.000000
z(z(-12.000000))=12.000000
z(z(-11.000000))=11.000000
z(z(-10.000000))=10.000000
z(z(-9.000000))=9.000000
z(z(-8.000000))=8.000000
z(z(-7.000000))=7.000000
z(z(-6.000000))=6.000000
z(z(-5.000000))=5.000000
z(z(-4.000000))=4.000000
z(z(-3.000000))=3.000000
z(z(-2.000000))=2.000000
z(z(-1.000000))=1.000000
z(z(0.000000))=0.000000
z(z(1.000000))=-1.000000
z(z(2.000000))=-2.000000
z(z(3.000000))=-3.000000
z(z(4.000000))=-4.000000
z(z(5.000000))=-5.000000
z(z(6.000000))=-6.000000
z(z(7.000000))=-7.000000
z(z(8.000000))=-8.000000
z(z(9.000000))=-9.000000
z(z(10.000000))=-10.000000
z(z(11.000000))=-11.000000
z(z(12.000000))=-12.000000
z(z(13.000000))=-13.000000
z(z(14.000000))=-14.000000
z(z(15.000000))=-15.000000
z(z(16.000000))=-16.000000
z(z(17.000000))=-17.000000
z(z(18.000000))=-18.000000
z(z(19.000000))=-19.000000
z(z(-2.000000))=2.000000
z(z(-1.900000))=1.900000
z(z(-1.800000))=1.800000
z(z(-1.700000))=1.700000
z(z(-1.600000))=1.600000
z(z(-1.500000))=1.500000
z(z(-1.400000))=1.400000
z(z(-1.300000))=1.300000
z(z(-1.200000))=1.200000
z(z(-1.100000))=1.100000
z(z(2.000000))=-2.000000
z(z(2.100000))=-2.100000
z(z(2.200000))=-2.200000
z(z(2.300000))=-2.300000
z(z(2.400000))=-2.400000
z(z(2.500000))=-2.500000
z(z(2.600000))=-2.600000
z(z(2.700000))=-2.700000
z(z(2.800000))=-2.800000
z(z(2.900000))=-2.900000
z(z(0.124545))=-0.124545
*/


text:
# Numbers of purity

Today we'll look at a sequence $$\a\$$, related to the Collatz function $$\f\$$:

$$f = \begin{cases} n/2 & \text{if } n \equiv 0 \text{ (mod }2) \\ 3n+1 & \text{if } n \equiv 1 \text{ (mod }2) \\ \end{cases}$$

We call a sequence of the form $$\z, f(z), f(f(z)), …\$$ a Collatz sequence.

The first number in our sequence, $$\a(1)\$$, is $$\0\$$. Under repeated application of $$\f\$$, it falls into a cycle $$\0\to0\to0\to\:\cdots\$$

The smallest number we haven't seen yet is 1, making $$\a(2)=1\$$. Under repeated application of $$\f\$$, it falls into a cycle $$\1\to4\to2\to1\to\cdots\$$

Now we have seen the number $$\2\$$ in the cycle above, so the next smallest number is $$\a(3) = 3\$$, falling into the cycle $$\3\to10\to5\to16\to8\to4\to2\to1\to4\to\cdots\$$

In all above cycles we've seen $$\4\$$ and $$\5\$$ already, so the next number is $$\a(4) = 6\$$.

By now you should get the idea. $$\a(n)\$$ is the smallest number that was not part of any Collatz sequences for all $$\a(1), ..., a(n-1)\$$

Write a program or function that, given an positive integer $$\n\$$, returns $$\a(n)\$$. Shortest code in bytes wins.

Testcases:

1  -> 0
2  -> 1
3  -> 3
4  -> 6
5  -> 7
6  -> 9
7  -> 12
8  -> 15
9  -> 18
10 -> 19
50 -> 114

(This is OEIS sequence A061641.)

• Obligatory OEIS Aug 12, 2016 at 20:26
• Can input n be 0-based? Aug 12, 2016 at 22:20
• a(n+1) = a(n) odd: 3*a(n)+1, or a(n) even: a(n)/2 Aug 12, 2016 at 23:08
• @LuisMendo Sorry, I somehow missed your message. No, reproduce the exact sequence as in the challenge.
– orlp
Aug 13, 2016 at 9:14
• If a isn't 0-based I don't understand why you seem to be "talking 0-based" here: a(n) is the smallest number that was not part of any Collatz sequences for all a(0), …, a(n − 1). Aug 13, 2016 at 16:29

c x|x<2=[[0,2]!!x]|odd x=x:c(3*x+1)|1<2=x:c(div x 2)
([y|y<-[-1..],all(/=y)$c=<<[0..y-1]]!!)  Usage example: ([y|y<-[-1..],all(/=y)$c=<<[0..y-1]]!!) 10 -> 19.

c x is the Collatz cycle for x with a little bit of cheating for x == 1. The main functions loops through all integers and keeps those that are not in c x for x in [0..y-1]. Pretty much a direct implementation of the definition. As Haskell index operator !! is 0-based, I start at -1 to prepend a (otherwise useless) number to get the index fixed.

# Jelly, 20 19 bytes

ḟ@JḢ×3‘$HḂ?ÐĿ;Ṛ Ç¡Ṫ  ### How it works Ç¡Ṫ Main link. No explicit arguments. Default argument: 0 ¡ Read an integer n from STDIN and do the following n times. Ç Call the helper link. Ṫ Tail; extract the last element of the resulting array. ḟ@JḢ×3‘$HḂ?ÐĿ;Ṛ  Helper link. Argument: A (array)

J              Yield all 1-based indices of A, i.e., [1, ..., len(A)]. Since 0
belongs to A, there is at least one index that does belong to A.
ḟ@               Filter-false swapped; remove all indices that belong to A.
Ḣ             Head; extract the first index (i) that hasn't been removed.
ÐĿ    Call the quicklink to the left on i, then until the results are no
longer unique. Collect all unique results in an array.
Ḃ?      If the last bit of the return value (r) is 1:
$Apply the monadic 3-link chain to the left to r. ×3‘ Yield 3r + 1. H Else, halve r. Ṛ Yield A, reversed. ; Concatenate the results array with reversed A.  After n iterations, the value of a(n + 1) will be at the beginning of the array. Since we concatenate the new array with a reversed copy of the old one, this means that a(n) will be at the end. # MATL, 46 40 bytes Oiq:"tX>Q:yX-X<t0)to?3*Q}2/]h5M1>]Pv]0)  Try it online! ### Explanation The code has an outer for loop that generates n Collatz sequences, one in each iteration. Each sequence is generated by an inner do...while loop that computes new values and stores them in a sequence vector until a 1 or 0 is obtained. When we are done with the sequence, the vector is reversed and concatenated to a global vector that contains the values from all previous sequences. This vector may contain repeated values. The reversing of the sequence vector ensures that at the end of the outer loop the desired result (the starting value of the last sequence) will be at the end of the global vector. Pseudo-code: 1 Initiallization 2 Generate n sequences (for loop): 3 Compute initial value for the k-th sequence 4 Generate the k-th sequence (do...while loop) 5 Starting from latest value so far, apply the Collatz algorithm to get next value 6 Update sequence with new value 7 Check if we are done. If so, exit loop. We have the k-th sequence 8 Update vector of seen values 9 We now have the n sequences. Get final result  Commented code: O % Push 0 1 iq: % Input n. Generate [1 2 ... n-1] · " % For loop: repeat n-1 times. Let k denote each iteration 2 t % Duplicate vector of all seen values · 3 X>Q % Take maximum, add 1 · · : % Range from 1 to that: these are potential initial values · · y % Duplicate vector of all seen values · · X-X< % Set difference, minimum: first value not seen · ·  % Do...while: this generates the k-th Collatz sequence · 4 t0) % Duplicate, push last value of the sequence so far · · 5 to % Duplicate, parity: 1 if odd, 0 if even · · · ? % If odd · · · 3*Q % Times 3, plus 1 · · · } % Else · · · 2/ % Half · · · ] % End if · · · h % Concatenate new value of the sequence · · 6 5M % Push the new value again · · 7 1> % Does it exceed 1? This is the loop condition · · · ] % End do...while. The loops ends when we have reached 0 or 1 · · P % Reverse the k-th Collatz sequence · 8 v % Concatenate with vector of previously seen values · · ] % End for · 0) % Take last value. Implicitly display. 9  # Brachylog, 70676563 62 bytes ,[]:?:1ih. ,0<=X=,?'eXg{t{:2/.*?|:3*+.}gB,(?.sB;?:Bc:2&.)}:?c.  Try it online! # Python 2, 97 96 bytes r,=s={-1} exec'n=r=min({r+1,r+2,r+3}-s)\nwhile{n}-s:s|={n};n=(n/2,3*n+1)[n%2]\n'*input() print r  Takes advantage of the fact that all multiples of 3 are pure. Test it on Ideone. ### How it works On the first line, r,=s={-1} sets s = {-1} (set) and r = -1. Next we read an integer from STDIN, repeat a certain string that many times, then execute it. This is equivalent to the following Python code. for _ in range(input()) n=r=min({r+1,r+2,r+3}-s) while{n}-s: s|={n} n=(n/2,3*n+1)[n%2]  In each iteration, we start by finding the smallest member of {r+1, r+2, r+3} that does not belong to s. In the first iteration, this initializes r as 0. In all subsequent runs, s may (and will) contain some of r+1, r+2 and r+3, but never all of them, since all multiples of 3 are pure. To verify this statement, observe that no multiple m of 3 is of the form 3k + 1. That leaves 2m as the only possible pre-image, which is also a multiple of 3. Thus, m cannot appear in the Collatz sequence of any number that is less than m, and is therefore pure. After identifying r and initializing n, we apply the Collatz function with n=(n/2,3*n+1)[n%2], adding each intermediate value of n to the set s with s|={n}. Once we encounter a number n that is already in s, {n}-s will yield an empty set, and the iteration stops. The last value of r is the desired element of the sequence. • To add to this, a proof that all multiples of 3 are pure. Look at any Collatz sequence modulo 3. After any application of the 3x+1 rule, the modulo is 1. After the application of the x/2 rule, mod 1 becomes 2, and mod 2 becomes 1. Neither rule can generate a multiple of 3, unless the starting value already was a bigger multiple of 3 that got halved. But those are bigger values not generated yet, so n=0 (mod 3) => n is pure. – orlp Aug 13, 2016 at 7:42 # Pyth, 32 bytes VtQ=+Y.u?%N2h*3N/N2Z)=Zf!}TYhZ)Z  Test suite. # Java, 148 bytes int a(int n){if(n<2)return 0;int f=a(n-1),b,i,c;do{f++;for(b=1,i=1;i<n;i++)for(c=i==2?4:a(i);c>1;c=c%2>0?c*3+1:c/2)b=c==f?0:b;}while(b<1);return f;}  Ideone it! (Warning: exponential complexity due to zero optimization.) Converting it from a do...while loop to a for loop would be golfier, but I am having trouble doing so. Golfing advice is welcome as usual. • Not much, but you can golf 1 byte off by changing for(b=1,i=1;i<n;i++) to for(b=1,i=0;++i<n;). Btw, I understand why your ideone is missing the test case for 50, but why does it also miss the 10? It can handle it without a problem. Aug 25, 2016 at 11:06 • @KevinCruijssen Because the formatting would be bad. Aug 25, 2016 at 11:16 • Not the best improvement but I didn't spent too much time... (147 bytes) int a(int n){if(n<2)return 0;int f=a(n-1),b=0,i,c;for(;b<1;){f++;for(b=1,i=1;i<n;i++)for(c=i==2?4:a(i);c>1;c=c%2>0?c*3+1:c/2)b=c==f?0:b;}return f;} – Poke Aug 25, 2016 at 13:50 ## Perl6, 96 my @s;my$a=0;map {while ($a=@s[$a]=$a%2??3*$a+1!!$a/2)>1 {};while @s[++$a] {}},2..slurp;$a.say;  Based on the Perl 5 answer. A bit longer since Perl6 syntax is less forgiving than Perl5 syntax, but I'll settle with this for now. # PHP, 233 124 bytes <?$n=$argv[1];for($c=[];$n--;){for($v=0;in_array($v,$c);)$v++;for(;$n&&!in_array($v,$c);$v=$v&1?3*$v+1:$v/2)$c[]=$v;}echo$v;  +4 for function: function a($n){for($c=[];$n--;){for($v=0;in_array($v,$c);)$v++;for(;$n&&!in_array($v,$c);$v=$v&1?3*$v+1:$v/2)$c[]=$v;}return$v;}

# Perl 5 - 74 bytes

map{0 while 1<($a=$c[$a]=$a%2?$a*3+1:$a/2);0 while$c[++$a]}2..<>;print$a+0  This is a pretty straightforward solution. It repeatedly applies the Collatz function to the variable $a and stores in the array @c that the value has been seen, then after reaching 0 or 1 it increments $a until it's a number that hasn't been seen yet. This is repeated a number of times equal to the input minus 2, and finally the value of $a is outputted.

# Mathematica, 134 bytes

f=If[EvenQ@#,#/2,3#+1]&;a@n_:=(b={i=c=0};While[i++<n-1,c=First[Range@Max[#+1]~Complement~#&@b];b=b~Union~NestWhileList[f,c,f@#>c&]];c)

f = If[EvenQ@#, #/2, 3#+1] &;                        Collatz function
a@n_ := (                                            defines a(n)
b = {i = c = 0};                                   initializations
b is the growing sequence


text:
## LaTeX forum ⇒ Fonts & Character Sets ⇒ How to let my fonts smaller?

Information and discussion about fonts and character sets (e.g. how to use language specific characters)
yaozhao
Posts: 55
Joined: Sat Oct 27, 2018 10:38 pm

### How to let my fonts smaller?

Code: [Select all] [Expand/Collapse] [Download] ({untitled.tex})
\begin{table}\caption {\label{tab:table1} SUMMARY STATISTICS FOR CONTRIBUTIONS BY INDIVIDUAL CONTRIBUTORS}

My title of table is:SUMMARY STATISTICS FOR CONTRIBUTIONS BY INDIVIDUAL CONTRIBUTORS

How to let it be smaller to ensure it could be within one line?

Bartman
Posts: 71
Joined: Fri Jan 03, 2020 2:39 pm
The font size of the table captions should be the same. The package caption can set the font size for all captions in a document or only for one.

Ijon Tichy
Posts: 269
Joined: Mon Dec 24, 2018 10:12 am
Don't use capitals for all letters. Mixed case text is less wide and better to read.
Code: [Select all] [Expand/Collapse] [Download] (capitalsvsmixedcase.tex)
\documentclass{article} \begin{document} \begin{table} \caption{SUMMARY STATISTICS FOR CONTRIBUTIONS BY INDIVIDUAL CONTRIBUTORS} \addtocounter{table}{-1}% \caption{Summary statistics for contributions by individual contributors}\end{table} \end{document}

BTW: Terms in capitals should be letter-spaced, to improve the readability and typograph:
Code: [Select all] [Expand/Collapse] [Download] (withletterspacing.tex)
\documentclass{article}\usepackage{microtype}\begin{document} \begin{table} \caption{\textls{% Use poor man's letter spacing of microtype     SUMMARY STATISTICS FOR CONTRIBUTIONS BY INDIVIDUAL CONTRIBUTORS}} \addtocounter{table}{-1}% \caption{SUMMARY STATISTICS FOR CONTRIBUTIONS BY INDIVIDUAL CONTRIBUTORS} \addtocounter{table}{-1}% \caption{Summary statistics for contributions by individual contributors}\end{table} \end{document}

Return to “Fonts & Character Sets”

### Who is online

Users browsing this forum: No registered users and 3 guests


text:
Reducing time complexity for finding all possible triplets in an array? [closed]

So I have an array sized N. It is sure that array has all distinct elements.

I need to find sum of all possible triplets in that array and for that i need to find all possible triplets.

What i did: looping through array with three nested $for$ loops but that gives O(n^3).

I want to optimise the algorithm as n is very large(upto 10000)

Eg: Array==> {1,2,3,4,5}

Possible triplets: {1,2,3} {1,2,4} {1,2,5} {1,3,4} {1,3,5} {1,4,5} {2,3,4} {2,3,5} {2,4,5} {3,4,5}

• What do you mean by "sum of all possible triplets"? The sum of the elements in each triplet over all triplets? Jan 21 '17 at 15:19
• @quicksort Yes.. Jan 21 '17 at 15:58
• The beginners mistake: You found an obvious way to get the result, and there is a step in that obvious method taking O (n^3). You try to find a way to do that part faster, instead of stepping back and realising that there is no need actually to solve that problem. Jan 21 '17 at 16:59
• @gnasher729 Not quite a beginners mistake but a reading mistake , I misread the question quicksort asked above , hence he gave the solution according to it which was pretty obvious.. Jan 21 '17 at 18:13
• Could you clarify what the output is supposed to be? You've commented on an answer that it's not calculating the right thing but the answer looks like a perfectly reasonable interpretation of what you've written. Jan 21 '17 at 19:08

Finding all the triplets is in fact useless. Let $|A| = n$. Observe that each $a \in A$ appears in exactly $\binom{n-1}{2}$ triplets.

Therefore, the requested sum is just:

$$\sum_{a \in A} \binom{n-1}{2}a = \binom{n-1}{2} \sum_{a \in A} a$$

• ... and calculated in O (n). Jan 21 '17 at 16:56
• Hey, I think i misread you question above , I want the sum of every triplet individually like {1,2,3}=1+2+3=6 {1,2,4}=1+2+4=7 Jan 21 '17 at 18:11
• @AyushGoyal, I'm officially confused. Can you please state your problem formally? What output would you like exactly? If you need even just one symbol per triplet, then you're bound to a solution in $\Omega(n^3)$, as there are $\binom{n}{3} \in \Theta(n^3)$ triplets. Jan 21 '17 at 18:24

Let n be the length of the array A

for (i = 0, i < n - 2, i++)
for (j = i + 1, j < n - 1, j++)
for (k = j + 1, k < n - 0, k++)
sum += i + j + k

You are iterating each result exactly once. I don't think you are going to do better on the iteration. It is O($\binom{n}{3}$). You can get number from combination.

If you look at as every element will appear with every other pair (2) from a set of n-1 then combin(n-1,2) for each element. Just sum the array and multiply by that number.

$\sum_{a \in A} \binom{n-1}{2}$


text:
In thermodynamics, enthalpy, symbolized by H, summarized as ‘heat content’, is defined as the sum of the internal energy of a thermodynamic system plus the energy associated with work done by the system on the atmosphere, i.e. the product of the pressure times the volume. Enthalpy reflects the number and kinds of chemical bonds in the reactants and products. [1] In equation form, enthalpy is defined as follows:

$H = U + PV \,$

The quantity H, equal to the internal energy plus the pressure volume energy, was first recognized by American engineer Willard Gibbs as playing an important role for processes occurring at constant pressure, and was called by him ‘heat content’.

Etymology
Italian physical chemist Salvatore Califano states that the term was introduced by Dutch physicist Heike Kamerlingh-Onnes at the first meeting of the Institute of Refrigeration in Paris in 1908. [5]

Alternatively, Canadian physical chemist Keith Laidler stated that Onnes introduced the term "enthalpy" in 1909, symbol H, from the Greek εν (en) ‘in’ and θαλπος (thalpos) ‘to heat’, which combined define the word enthalpos, to warm within. [4]

American protein thermodynamicist Donald Haynie, defines enthalpy, in the context of biological thermodynamics (chnops-thermodynamics), as a ‘thermodynamic state function usually measured as heat transferred to or from a system at constant pressure.’ [2] With the constraints of constant pressure and amount of substance, the differential change in enthalphy dH, of a system evolving in such conditions, equals the amount of heat dQP exchanged with the surroundings.’ [3]

Enthalpy-entropy compensation

References
1. Lehninger, A.L., Nelson, D.L., & Cox, M.M. (1993). Principles of Biochemistry, 2nd ed. New York: Worth Publishers.
2. Haynie, Donald T. (2001). Biological Thermodynamics. Cambridge: Cambridge University Press.
3. Perrot, P. (1998). A to Z of Thermodynamics. Oxford: Oxford University Press.
4. Laidler, Keith J. (1993). The World of Physical Chemistry (pg. 110). Oxford University Press.
5. Califano, Salvatore. (2012). Pathways to Modern Chemical Physics (pg. 7). Springer.


text:
Which expression is equivalent to 2x-9+7x?

Nov 30, 2016

$9 x - 9$ or $9 \left(x - 1\right)$
$2 x - 9 + 7 x \to 2 x + 7 x - 9 \to \left(2 + 7\right) x - 9 \to 9 x - 9 \to$
$9 \cdot x - 9 \cdot 1 \to 9 \left(x - 1\right)$


text:
# grdtrack

grdtrack(cmd0::String="", arg1=nothing, arg2=nothing; kwargs...)

Sample grids at specified (x,y) locations

## Description

Reads one or more grid files (or a Sandwell/Smith IMG files) and a table (from file or standard input; but see profile for exception) with (x,y) [or (lon,lat)] positions in the first two columns (more columns may be present). It interpolates the grid(s) at the positions in the table and writes out the table with the interpolated values added as (one or more) new columns. Alternatively (crossprofile), the input is considered to be line-segments and we create orthogonal cross-profiles at each data point or with an equidistant separation and sample the grid(s) along these profiles. A bicubic [Default], bilinear, B-spline or nearest-neighbor (see interp) interpolation is used, requiring boundary conditions at the limits of the region (see interp; Default uses "natural" conditions (second partial derivative normal to edge is zero) unless the grid is automatically recognized as periodic.)

## Required Arguments

• table
One or more data tables holding the (x,y) positions where the user wants to sample the 2-D data set. Mandatory except if profile option is used.

• G or grid : – grid=GMTgrid | grid=gridfile
GMTgrid (a grid type) or gridfile is a 2-D binary grid file with the function f(x,y). If the specified grid is in Sandwell/Smith Mercator format you must append a comma-separated list of arguments that includes a scale to multiply the data (usually 1 or 0.1), the mode which stand for the following: (0) Img files with no constraint code, returns data at all points, (1) Img file with constraints coded, return data at all points, (2) Img file with constraints coded, return data only at constrained points and NaN elsewhere, and (3) Img file with constraints coded, return 1 at constraints and 0 elsewhere, and optionally the max latitude in the IMG file [80.738]. You may repeat grid as many times as you have grids you wish to sample. Alternatively, use -G+l\list to pass a file whose first word in the trailing text record will be extracted as the file names. The grids are sampled and results are output in the order given. Note: If gridfile is a remote global grid and no registration is specified then grdtrack will default to gridline registration (instead of the default pixel registration) to ensure all input points are inside the grid.

## Optional Arguments

• A or interp_path or resample : – interp_path=[f|p|m|r|R][+l]
For track resampling (if crossprofile or profile are set) we can select how this is to be performed. Append f to keep original points, but add intermediate points if needed [Default], m as f, but first follow meridian (along y) then parallel (along x), p as f, but first follow parallel (along y) then meridian (along x), r to resample at equidistant locations; input points are not necessarily included in the output, and R as r, but adjust given spacing to fit the track length exactly. Finally, append +l if geographic distances should be measured along rhumb lines (loxodromes) instead of great circles. Ignored unless crossprofile is used.

• C or crossprofile : – crossprofile=length/ds[/spacing][+a|v][d|f *value][l|r]
Use input line segments to create an equidistant and (optionally) equally-spaced set of crossing profiles along which we sample the grid(s) [Default simply samples the grid(s) at the input locations]. Specify two length scales that control how the sampling is done: length sets the full length of each cross-profile, while ds is the sampling spacing along each cross-profile. Optionally, append / spacing for an equidistant spacing between cross-profiles [Default erects cross-profiles at the input coordinates]; see interp_path for how resampling the input track is controlled. By default, all cross-profiles have the same direction (left to right as we look in the direction of the input line segment). Append +a to alternate the direction of cross-profiles, or v to enforce either a "west-to-east" or "south-to-north" view. By default the entire profiles are output. Choose to only output the left or right halves of the profiles by appending +l or +r, respectively. Append suitable units to length; it sets the unit used for ds (and spacing) (See Units below). The default unit for geographic grids is meter while Cartesian grids implies the user unit. The output columns will be lon, lat, dist, azimuth, z1, z2, ..., zn (The zi are the sampled values for each of the n grids). Use +d to change the profiles from being orthogonal to the line by the given deviation [0]. Looking in the direction of the line, a positive deviation will rotate the crosslines clockwise and a negative one will rotate them counter-clockwise. Finally, you can use +f to set a fixed azimuth for all profiles.

• D or dfile : – dfile=fname
In concert with crossprofile we can save the (possibly resampled) original lines to the file fname [Default only saves/returns the cross-profiles]. The columns will be lon, lat, dist, azimuth, z1, z2, ... (sampled value for each grid)

• E or profile : – profile=line\ [,\line,...][+a\az][+c][+d][+g][+i\inc][+l\length][+n\np][+o\az][+r\radius]
Instead of reading input track coordinates, specify profiles via coordinates and modifiers. The format of each line is start/stop, where start or stop are either lon/lat (x/y for Cartesian data) or a 2-character XY key that uses the text-style justification format to specify a point on the map as [LCR][BMT]. Each line will be a separate segment unless +c is used which will connect segments with shared joints into a single segment. In addition to line coordinates, you can use Z-, Z+ to mean the global minimum and maximum locations in the grid (only available if a single grid is given via grid). You may append +i\inc to set the sampling interval; if not given then we default to half the minimum grid interval. For a line along parallels or meridians you can add +g to report degrees of longitude or latitude instead of great circle distances starting at zero. Instead of two coordinates you can specify an origin and one of +a, +o, or +r. The +a sets the azimuth of a profile of given length starting at the given origin, while +o centers the profile on the origin; both require +l. For circular sampling specify +r to define a circle of given radius centered on the origin; this option requires either +n or +i. The +n\np modifier sets the desired number of points, while +l\length gives the total length of the profile. Append +d to output the along-track distances after the coordinates. Note: No track file will be read. Also note that only one distance unit can be chosen. Giving different units will result in an error. If no units are specified we default to great circle distances in km (if geographic). If working with geographic data you can use -j to control distance calculation mode [Great Circle]. Note: If crossprofile is set and spacing is given the that sampling scheme overrules any modifier set in profile.

• F or critical : – critical=[+b][+n][+r][+z\z0]
Find critical points along each cross-profile as a function of along-track distance. Requires crossprofile and a single input grid (z). We examine each cross-profile generated and report (dist, lonc, latc, distc, azimuthc, zc) at the center peak of maximum z value, (lonl, latl, distl) and (lonr, latr, distr) at the first and last non-NaN point whose z-value exceeds z0, respectively, and the width based on the two extreme points found. Here, dist is the distance along the original input trackfile and the other 12 output columns are a function of that distance. When searching for the center peak and the extreme first and last values that exceed the threshold we assume the profile is positive up. If we instead are looking for a trough then you must use +n to temporarily flip the profile to positive. The threshold z0 value is always given as >= 0; use +z to change it [0]. Alternatively, use +b to determine the balance point and standard deviation of the profile; this is the weighted mean and weighted standard deviation of the distances, with z acting as the weight. Finally, use +r to obtain the weighted rms about the cross-track center (distc == 0). Note: We round the exact results to the nearest distance nodes along the cross-profiles. We write 13 output columns per track: dist, lonc, latc, distc, azimuthc, zc, lonl, latl, distl, lonr, latr, distr, width.

• N or no_skip or noskip : – no_skip=true
Do not skip points that fall outside the domain of the grid(s) [Default only output points within grid domain].

• R or region or limits : – limits=(xmin, xmax, ymin, ymax) | limits=(BB=(xmin, xmax, ymin, ymax),) | limits=(LLUR=(xmin, xmax, ymin, ymax),units="unit") | ...more
Specify the region of interest. More at limits. For perspective view view, optionally add zmin,zmax. This option may be used to indicate the range used for the 3-D axes. You may ask for a larger w/e/s/n region to have more room between the image and the axes.

• S or stack : – stack=method/modifiers
In conjunction with crossprofile, compute a single stacked profile from all profiles across each segment. Append how stacking should be computed: a = mean (average), m = median, p = mode (maximum likelihood), l = lower, L = lower but only consider positive values, u = upper, U = upper but only consider negative values [a]. The modifiers control the output; choose one or more among these choices: +a : Append stacked values to all cross-profiles. +d : Append stack deviations to all cross-profiles. +r : Append data residuals (data - stack) to all cross-profiles. +s\ [file] : Save stacked profile to file [grdtrackstackedprofile.txt]. +c\fact : Compute envelope on stacked profile as ±\fact *\deviation [2]. Notes: (1) Deviations depend on method and are st.dev (a), L1 scale, i.e., 1.4826 * median absolute deviation (MAD) (for m and p), or half-range (upper-lower)/2. (2) The stacked profile file contains a leading column plus groups of 4-6 columns, with one group for each sampled grid. The leading column holds cross distance, while the first four columns in a group hold stacked value, deviation, min value, and max value, respectively. If method is one of a\|\m\|\p then we also write the lower and upper confidence bounds (see +c). When one or more of +a, +d, and +r are used then we also append the stacking results to the end of each row, for all cross-profiles. The order is always stacked value (+a), followed by deviations (+d) and finally residuals (+r). When more than one grid is sampled this sequence of 1-3 columns is repeated for each grid.

To be used with normal grid sampling, and limited to a single, non-IMG grid. If the nearest node to the input point is NaN, search outwards until we find the nearest non-NaN node and report that value instead. Optionally specify a search radius which limits the consideration to points within this distance from the input point. To report the location of the nearest node and its distance from the input point, append +e. The default unit for geographic grid distances is spherical degrees. Use radius to change the unit and give radius = 0 if you do not want to limit the radius search. To instead replace the input point with the coordinates of the nearest node, append +p.

• V or verbose : – verbose=true | verbose=level
Select verbosity level. More at verbose

• Z or z_only : – z_only=true
Only write out the sampled z-values [Default writes all columns]. Note: If used in conjunction with -s then the default column becomes 0 instead of 2. If specifying specific columns in -s then start numbering the z-columns from 0 instead of 2.

• a or aspatial : – aspatial=??
Control how aspatial data are handled in GMT during input and output. More at

• bi or binary_in : – binary_in=??
Select native binary format for primary table input. More at

• bo or binary_out : – binary_out=??
Select native binary format for table output. More at

• di or nodata_in : – nodata_in=??
Substitute specific values with NaN. More at

• e or pattern : – pattern=??
Only accept ASCII data records that contain the specified pattern. More at

• f or colinfo : – colinfo=??
Specify the data types of input and/or output columns (time or geographical data). More at

• g or gap : – gap=??
Examine the spacing between consecutive data points in order to impose breaks in the line. More at

Specify that input and/or output file(s) have n header records. More at

• i or incol or incols : – incol=col_num | incol="opts"
Select input columns and transformations (0 is first column, t is trailing text, append word to read one word only). More at incol

• j or spherical_dist or spherical : – spherical=greatcirc or spherical=:flat or spherical=:ellipsoidal
Determine how spherical distances are calculated in modules that support this [Default is spherical=:greatcirc]. GMT has different ways to compute distances on planetary bodies:

• spherical=:greatcirc to perform great circle distance calculations, with parameters such as distance increments or radii compared against calculated great circle distances [Default is spherical=:greatcirc].

• spherical=:flat to select Flat Earth mode, which gives a more approximate but faster result.

• spherical=:ellipsoidal to select ellipsoidal (or geodesic) mode for the highest precision and slowest calculation time.

Note: All spherical distance calculations depend on the current ellipsoid (PROJ_ELLIPSOID), the definition of the mean radius (PROJ_MEAN_RADIUS), and the specification of latitude type (PROJ_AUX_LATITUDE). Geodesic distance calculations is also controlled by method (PROJ_GEODESIC).

• n or interp or interpol : – interp=params
Select interpolation mode for grids. More at interp

• o or outcol : – outcol=??
Select specific data columns for primary output, in arbitrary order. More at

• q or inrows : – inrows=??
Select specific data rows to be read and/or written. More at

• s or skiprows or skip_NaN : – skip_NaN=true | skip_NaN="<cols[+a][+r]>"
Suppress output of data records whose z-value(s) equal NaN. More at

• w or wrap or cyclic : – wrap=??
Convert input records to a cyclical coordinate. More at

• yx : – yx=true
Swap 1st and 2nd column on input and/or output. More at

Units

For map distance unit, append unit d for arc degree, m for arc minute, and s for arc second, or e for meter [Default unless stated otherwise], f for foot, k for km, M for statute mile, n for nautical mile, and u for US survey foot. By default we compute such distances using a spherical approximation with great circles (-jg) using the authalic radius (see PROJ_MEAN_RADIUS). You can use -jf to perform “Flat Earth” calculations (quicker but less accurate) or -je to perform exact geodesic calculations (slower but more accurate; see PROJ_GEODESIC for method used).

.. include:: explaingrdresample2.rst

## Hints

If an interpolation point is not on a node of the input grid, then a NaN at any node in the neighborhood surrounding the point will yield an interpolated NaN. Bicubic interpolation [default] yields continuous first derivatives but requires a neighborhood of 4 nodes by 4 nodes. Bilinear interpolation [interp] uses only a 2 by 2 neighborhood, but yields only zeroth-order continuity. Use bicubic when smoothness is important. Use bilinear to minimize the propagation of NaNs, or lower threshold.

## Examples

To extract a profile along a great circle between (0,0) to (20,20) from the remote grid earthrelief05m, and only write out (dist, topo) records, try

using GMT
D = grdtrack("@earth_relief_05m", region=(0,20,0,20), profile="BL/TR+d", o="3,2")
imshow(D)

To sample the file hawaiitopo.nc along the SEASAT track track4.xyg (An ASCII table containing longitude, latitude, and SEASAT-derived gravity, preceded by one header record)

D = grdtrack("track_4.xyg", grid="hawaii_topo.nc", header=1)

To sample the Sandwell/Smith IMG format file grav.18.1.img (1 minute free-air anomalies on a Mercator grid) along 100-km-long cross-profiles that are orthogonal to the line segment given in the file track.xy, erecting cross-profiles every 25 km and sampling the grid every 3 km, try

grdtrack("track.xy", grid="grav.18.1.img,0.1,1", crossprofile=("100k",3,25), interp_path=:r)

The same thing, but now determining the central anomaly location along track, with a threshold of 25 mGal, try

grdtrack("track.xy", grid="grav.18.1.img,0.1,1", crossprofile=("100k",3,25), critical="+z25")

To sample the grid data.nc along a line from the lower left to the upper right corner, using a grid spacing of 1 km on the geodesic, and output distances as well, try

grdtrack(profile="LB/RT+i1k+d", grid="data.nc", spherical=:ellipsoidal)


text:
## anonymous 4 years ago Can anyone has proof for slope-intercept form(y=mx+b)

1. anonymous

2. anonymous

@Yahoo! @ganeshie8 @TuringTest @Zarkon

3. anonymous

urgent!!! i have a seminar plzz

4. anonymous

@hartnn @hba plzz help

5. hartnn

its just a form of equation of line....it cannot have a proof....but other forms can be converted to this form y=mx+b using some arithmetic.

6. hartnn

and i am not typing... ha ha ha ..

7. anonymous

y=mx+b is a equation of a line or slope intercept form??

8. hartnn

y=,x+c is the slope intercept form of equation of line...

9. anonymous

y=mx+c what is c?

10. hartnn

y=mx+c or y=mx+b b or c is called 'y-intercept'

11. anonymous

i think its y=mx+b not c

12. hartnn

then b is y-intercept

13. anonymous

ohkkk!!

14. anonymous

it has'nt proof? right @hartnn

15. anonymous

right???

16. ganeshie8

|dw:1352994948909:dw|

17. anonymous

so

18. ganeshie8

lets say, P(x, y) is some point which lies on this line with slope m and y intercept = c, then the slope = m = (y-c)/x mx = y-c y = mx+c thus the point (x, y) on the line with slope m and y-intercept c lies on the line if and only if y = mx + c

19. anonymous

We know : $m = \frac{y - y_1}{x-x_1}$ $\implies m(x-x_1) = y - y_1 \implies mx - mx_1 + y_1 = y$ Here : $$y_1 - mx_1 =b = y- Intercept$$ $\color{green}{y = mx + b}$

20. anonymous

then the slope = m = (y-c)/x how did you get?? @ganeshie8

21. anonymous

thnx.. @waterineyes

22. ganeshie8

|dw:1352995454007:dw|

23. anonymous

3 statement ?????confused???? @waterineyes

24. anonymous

What @Hares333

25. anonymous

not satisfied?? @ganeshie8 plz explain me step by step

26. ganeshie8

do u knw the slope formula ?

27. anonymous

Here : --------- INTERCEPT how did you get? this line

28. anonymous

yaa @ganeshie8

29. anonymous

@ganeshie8 take that 'c' as b...

30. anonymous

|dw:1352995664496:dw|

31. anonymous

right? @ganeshie8

32. ganeshie8

right. u seeing 2 points on that line ? apply slope formula to those two points, and see what u get

33. ganeshie8

point1 : (0, c) point2 : (x ,y) slope = m = ?

34. anonymous

@Hares333 : $$y_1 - mx_1 = b$$ Becuase, in y-intercept, x_1 must be 0, so we are left with : y_1 = b = Intercept..

35. anonymous

See, I am taking the example of @ganeshie8 : He has taken : $$(x_1,y_1)$$ as $$(0,c)$$. Now : $$y_1 - mx_1 \implies c-0 \implies c$$ And $$c$$ is nothing but y-intercept..

36. anonymous

|dw:1352995977026:dw|

37. anonymous

right @ganeshie8

38. anonymous

39. anonymous

You can write "Slope" as m..

40. anonymous

1 question arise!!! is that What is the slope-intercept form..

41. anonymous

@waterineyes

42. anonymous

Slope Intercept form is what you are asking this question For...

43. anonymous

what's the diiference betweem slope-intercept form and equation of a line?

44. anonymous

We call 'm' as Slope and b or c as y-Intercept or simply Intercept.. So , this makes Slope-Intercept Form..

45. anonymous

and what about equation of a line?

46. anonymous

Slope-Intercept Form is the method for finding equation of a line... It is a way to find a line equation...

47. anonymous

Equation of Line represents that In 2 or 3-Dimensions, what are its dimensions.. How long it is along x-axis, how long it is in y-axis and z-axis etc etc...

48. anonymous

very-very thank you @waterineyes you are a gr8 helper!!!

49. anonymous

You are welcome dear...

50. anonymous

And @hartnn , this time I am typing.. Ha ha ha ha..