Is there any way to turn a uvec into vec?

Question

wanna do this:

#include <armadillo>


int main(){    
    arma::mat mat=arma::randn(5,5);    
    mat.each_col( [](arma::vec& vec){
        vec=arma::sort_index(vec);
    } );          
    return 0;

Is there any way to turn a uvec into vec?

Answer 1

Use arma::conv_to<DesiredType>::from(value).

See below

#include <armadillo>


int main(){
    arma::mat mat=arma::randn(5,5);

    mat.print("mat");

    mat.each_col( [](arma::vec& vec){
                      vec = arma::conv_to<arma::vec>::from(arma::sort_index(vec));
                  } );

    mat.print("mat");

    return 0;
}

With this we can convert the output of arma::sort_index, which is an arma::uvec, into an arma::vec and the assignment will work.