static Sample<Double> ofDouble(final double x, final double y) {
		return new DoubleSample(x, y);
	}
Create a new sample point from the given argument and sample result. It
represents the function arguments with the function value:
{@code f: x -> y}

@param x the argument
@param y the sample point result
@return a new sample point
jenetics.prog/src/main/java/io/jenetics/prog/regression/Sample.java