public int getColumn(V v) {
		if (!columnsByVertex.containsKey(v)) {
			throw new IllegalArgumentException("Vertex is not in row: " + v);
		}
		return columnsByVertex.get(v);
	}
Returns the column index for the given vertex

@param v the vertex 
@return the column index for the given vertex
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/Row.java