C++ Armadillo :: find_nonfinite














































C++ Armadillo :: find_nonfinite



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Description::
This is the basic C++ program of C++ armadillo library which shows how to get the element of matrix which are non finite numbers. It can be carried out by the help of inbuilt function "find_nonfinite" in armadillo library. It takes one parameter i.e input matrix name.
  • Return a column vector containing the indices of elements of X that are non-finite (ie. Inf or NaN)
  • The output vector must have the type uvec (ie. the indices are stored as unsigned integers of type uword)
  • X is interpreted as a vector, with column-by-column ordering of the elements of X
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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); //random matrix of size 5 x 5 (generared by this syntax)
A(1,1) = datum::inf; //replacing values at (1,1) and (2,2) of matrix A A(2,2) = datum::nan; uvec indices = find_nonfinite(A);
cout << "Matrix A::\n"<<endl;
cout<< A << endl;
cout << "Vector indices::\n"<<endl;
cout << indices << endl; A.elem( find_nonfinite(A) ).zeros(); //making non finite elements zero and displaying cout << "Matrix A::\n"<<endl;
cout<< A << 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      inf   0.5610   0.4998   0.3201
   0.7107   0.0227      nan   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 indices::

         6
        12

Matrix A::

   0.7868   0.4049   0.2742   0.8571   0.2393
   0.2505        0   0.5610   0.4998   0.3201
   0.7107   0.0227        0   0.4194   0.9105
   0.9467   0.5206   0.5439   0.7443   0.1648
   0.0193   0.3447   0.5219   0.2492   0.2455


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