function_taking_ref.cpp File Reference

#include <iostream>
#include <Eigen/SVD>

Functions
float	inv_cond (const Eigen::Ref< const Eigen::MatrixXf > &a)
int	main ()

Function Documentation

inv_cond()

float inv_cond

(

const Eigen::Ref< const Eigen::MatrixXf > &

a

)

                                                       {
  const Eigen::VectorXf sing_vals = a.jacobiSvd().singularValues();
  return sing_vals(sing_vals.size() - 1) / sing_vals(0);
}

References a.

Referenced by main().

main()

int main

(

)

           {
  Eigen::MatrixXf m = Eigen::MatrixXf::Random(4, 4);
  std::cout << "matrix m:\n" << m << "\n\n";
  std::cout << "inv_cond(m):          " << inv_cond(m) << "\n";
  std::cout << "inv_cond(m(1:3,1:3)): " << inv_cond(m.topLeftCorner(3, 3)) << "\n";
  std::cout << "inv_cond(m+I):        " << inv_cond(m + Eigen::MatrixXf::Identity(4, 4)) << "\n";
}

References inv_cond(), and m.