examples/det.C

Determinant of dense matrix over Z or sparse matrix over Zp.

/*
 * examples/det.C
 *
 * Copyright (C) 2005, 2010 D. Saunders,  J-G. Dumas
 * ========LICENCE========
 * This file is part of the library LinBox.
 *
 * LinBox is free software: you can redistribute it and/or modify
 * it under the terms of the  GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * ========LICENCE========
 */
 
#include <linbox/linbox-config.h>
#include <iostream>
 
#include <linbox/ring/modular.h>
#include <linbox/matrix/sparse-matrix.h>
#include <linbox/solutions/det.h>
 
using namespace LinBox;
using namespace std;
 
template<class MatRep> void handleDet( istream & matData, long p = 0);
 
int main (int argc, char **argv)
{
    commentator().setMaxDetailLevel (-1);
    commentator().setMaxDepth (-1);
    commentator().setReportStream (std::cerr);
 
    if (argc <= 1 || argc > 3) {
        cerr << "Usage: det <matrix-file-in-supported-format> [<p>]" << endl;
        return -1;
    }
 
   ifstream matData (argv[1]);
 
   if (!matData) {
       cerr << "Error opening matrix file " << argv[1] << endl;
       return -1;
   }
 
   // Example 1: dense matrix over integers.
    if (argc == 2 ) 
        handleDet< DenseMatrix< Givaro::ZRing< Integer > > > 
         (matData);
 
   // Example 2: sparse matrix over modular field.
    if (argc == 3 ) 
        handleDet< SparseMatrix< Givaro::Modular< double > > > 
         (matData, atoi(argv[2]));
}
 
template<class MatRep>
void handleDet(istream & matData, long p) {
   typedef typename MatRep::Field Ring;
   Ring R(p); 
   MatRep A(R);
   A.read(matData);
   cout << "Matrix is " << A.rowdim() << " by " << A.coldim() << endl;
 
    typename Ring::Element det_A;
    det (det_A, A);
 
    cout << "Determinant is ";
    R.write(cout, det_A) << endl;
}
 
// Local Variables:
// mode: C++
// tab-width: 4
// indent-tabs-mode: nil
// c-basic-offset: 4
// End:
// vim:sts=4:sw=4:ts=4:et:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s