[eigen] leftCol(0)

[Carlos Becker <carlosbecker@xxxxxxxxx>]

Hi everyone.

I was trying some code while writing the Block operations tutorial and found that the output of the following program does not make much sense:

#include <Eigen/Dense>

#include <iostream>

  

using namespace Eigen;

  

int main()

{

   Matrix<float,3,3> m;

m << 1,2,3,

    4,5,6,

    7,8,9;

    

std::cout << m.leftCols(0) << std::endl;

    

    return 0;

}

I wonder if this is a desired behaviour. I was expecting to get a compile-time error, or at least a run-time one.

Carlos