C++ Armadillo :: Indices of Unique elements of matrix














































C++ Armadillo :: Indices of Unique elements of matrix



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Description::
This is the basic C++ program of C++ armadillo library which shows how to get the indices of unique elements of the given matrix of some particular size. It can be carried out by the help of inbuilt function "find_unique" in armadillo library. "find_unique" function takes just the one parameter i.e the matrix name. It stores the indices of unique elements of matrix in ascending order.
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Program::

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

int main() {
// without initializing the random generator
//Creating a 3 x 2 random matrix and printing it
mat A;
A << 2 << 2 << 4 << endr << 4 << 6 << 6 << endr; uvec indices = find_unique(A); //finding indices of unique elements of matrix and storing in vector
cout << "Matrix A::\n" << endl;
cout << A << endl; cout << "Indices::\n" << endl; //Displaying
cout << indices << 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::
2.0000 2.0000 4.0000 4.0000 6.0000 6.0000 Indices:: 0 1 3


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