root / tests / test-det.C

/* -*- mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
//--------------------------------------------------------------------------
//                        Test for det
//                  
//--------------------------------------------------------------------------
// Clement Pernet
//-------------------------------------------------------------------------

#include <iomanip>
#include <iostream>
#include "fflas-ffpack/modular-balanced.h"
#include "timer.h"
#include "Matio.h"
#include "fflas-ffpack/ffpack.h"


using namespace std;

typedef ModularBalanced<double> Field;

int main(int argc, char** argv){

        int n;
        int nbit=atoi(argv[3]); // number of times the product is performed
        cerr<<setprecision(10);
        if (argc != 4)  {
                cerr<<"Usage : test-det <p> <A> <<i>"
                    <<endl
                    <<"         to compute the determinant of A mod p (i computations)"
                    <<endl;
                exit(-1);
        }
        Field F(atof(argv[1]));
        Field::Element * A;
        A = read_field(F,argv[2],&n,&n);
                
        Timer tim,t; t.clear();tim.clear(); 
        Field::Element d=0;
        for(int i = 0;i<nbit;++i){
                t.clear();
                t.start();
                d = FFPACK::Det (F, n, n, A, n);
                t.stop();
                tim+=t;
                if (i+1<nbit){
                        delete[] A;
                        A = read_field(F,argv[2],&n,&n);
                }
        }
                
        double mflops = 2.0/3.0*(n*n/1000000.0)*nbit*n/tim.usertime();
        F.write (cerr<<"n = "<<n<<" Det (A) = ",d)
                     << " mod "<<atoi(argv[1])<<" : t= "
                     << tim.usertime()/nbit 
                     << " s, Mffops = "<<mflops
                     << endl;
        
        cout<<n<<" "<<mflops<<" "<<tim.usertime()/nbit<<endl;
}