C++ Armadillo :: Max Min
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Description::
This is the basic C++ program of C++ armadillo library which shows how to find minimum and maximum element of rows and column of the given matrix and also of the given vector. It can be carried out by the help of inbuilt functions "max" and "min" in armadillo library. Both function takes two parametres. If one parameter is passed second is treated as zero. First is the input matrix name or vector name and second is integer value that is 0 or 1. 0 is for column wise and 1 is for row wise.
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Program::
#include <iostream>
#include <armadillo>using namespace std;
using namespace arma;
int main()
{ //initialize the random generator
//Create a 10 x 1 random vector and printing it
double y = min(v); //min element of vector
cout << "Vector V::\n"<<endl;
cout << v << endl;
cout << "Max element::\n"<<endl;
cout << x << endl;
cout << "Min element::\n"<<endl;
cout << y << endl;
//initialize the random generator
//Create a 4 x 4 random matrix and printing it
mat M = randu<mat>(4,4);
cout << M << endl;
rowvec A = max(M,0); //Max of each col
cout << "\nMatrix M::\n"<<endl;
colvec B = max(M,1); //Max of each row
cout << "Vector A::\n"<<endl;
cout << A << endl;
cout << "Vector B::\n"<<endl;
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::
Vector V::
0.7868
0.2505
0.7107
0.9467
0.0193
0.4049
0.2513
0.0227
0.5206
0.3447
Max element::
0.946668
Min element::
0.0192711
Matrix M::
0.2742 0.5219 0.7443 0.9105
0.5610 0.8571 0.2492 0.1648
0.1400 0.4998 0.2393 0.2455
0.5439 0.4194 0.3201 0.1983
Vector A::
0.5610 0.8571 0.7443 0.9105
Vector B::
0.9105
0.8571
0.4998
0.5439
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