C++ Armadillo :: Diagonal of Matrix














































C++ Armadillo :: Diagonal of Matrix



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Description::
This is the basic C++ program of C++ armadillo library which shows how to get the diagonal of the given matrix of some particular size. It can be carried out by the help of inbuilt function "diagvec" in armadillo library. "diagvec" function takes just one parameter i.e the input matrix name. This function is used to store the diagonal of input matrix.
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Program::

#include <iostream>
#include <armadillo>
using namespace std;
using namespace arma;

int main()
{
//initialize the random generator
//Create a 5 x 5 random matrix and printing it
mat A = randu<mat>(5,5);
vec B = diagvec(A); //calculating diagonal of matrix A and storing in B
cout << "Matrix A::\n"<<endl;
cout<< A << endl;
cout << "Vector B(Diagonal of matrix)::" << endl; //displaying cout<< B << endl;
return 0;
}
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Commands to run program on terminal::
$ g++ filename.cpp -o objectname -O2 -larmadillo

$ ./objectname
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Output::

Matrix A::
   0.7868   0.4049   0.2742   0.8571   0.2393
   0.2505   0.2513   0.5610   0.4998   0.3201
   0.7107   0.0227   0.1400   0.4194   0.9105
   0.9467   0.5206   0.5439   0.7443   0.1648
   0.0193   0.3447   0.5219   0.2492   0.2455


Vector B(Diagonal of matrix)::
   0.7868
   0.2513
   0.1400
   0.7443
   0.2455


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