/// <summary>
/// Implements the map function from functional programming. This 'maps' the
/// function lambda onto the vector cv and returns the result.
/// </summary>
/// <param name="cv">A ColumnVector object.</param>
/// <param name="lambda">A function that takes a double and returns a double.</param>
/// <returns>A vector with the function lambda mapped onto cv.</returns>
public static ColumnVector Map(this ColumnVector cv, Func <double, double> lambda)
{
// Note: the Select method refers to Enumerable.Select in the Linq
// namespace.
return(new ColumnVector(cv.Select(lambda).ToList()));
}