root / tests / test-frobenius.C

/* -*- mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
//--------------------------------------------------------------------------
//          Test for the krylov-elimination
//--------------------------------------------------------------------------
// usage: test-krylov-elim p A, to compute the rank profile of the (n+m)xn matrix B
// formed by the n identity vectors and the mxn matrix A over Z/pZ
//-------------------------------------------------------------------------

//-------------------------------------------------------------------------
#define DEBUG 0

#include <iostream>
#include <iomanip>
#include <list> 
#include <vector>
#include "Matio.h"
#include "timer.h"
using namespace std;
#include "fflas-ffpack/modular-positive.h"
#include "fflas-ffpack/ffpack.h"


typedef Modular<double> Field;

template<class T>
std::ostream& printvect(std::ostream& o, vector<T>& vect){
        for(size_t i=0; i < vect.size()-1; ++i)
                o << vect[i] << " " ;
        return o << vect[vect.size()-1] << std::endl;
        }

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

        int m,n;
        cout<<setprecision(20);
        
        if (argc!=4){
                cerr<<"usage : test-frobenius <p> <A> <c>"<<endl
                    <<"         to compute the frobenius normal form of the matrix A over Z/pZ, with conditonning parameter c"
                    <<endl;
                exit(-1);
        }
        Field F(  long(atoi(argv[1])));
        Field::Element one;
        F.init(one, 1UL);
        Field::Element * A = read_field<Field> (F,argv[2],&m,&n);
        size_t c = atoi(argv[3]);
        
        std::list<vector<Field::Element> > frobForm;
        Timer tim;
        tim.clear();
        tim.start();
        FFPACK::CharpolyArithProg (F, frobForm, n, A, n, c);
        tim.stop(); 
        std::list<vector<Field::Element> >::iterator it = frobForm.begin();
        while(it != frobForm.end()){
                printvect (cout, *(it++));
        }
        cerr<<c<<" "<<tim.usertime()<<" "<<4.55*n*n/1000000.0*n/tim.usertime()<<endl;
        delete[] A;
        return 0;              
}