function_taking_ref.cpp File Reference

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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

)

Definition at line 4 of file function_taking_ref.cpp.

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

main()

int main

(

)

Definition at line 10 of file function_taking_ref.cpp.

{
  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";
}