linbox
examples/echelon.C

Echelon form of matrix over Zp.

/*
* examples/echelon.C
*
* Copyright (C) 2007, 2010 C. Pernet
* ========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 <iostream>
#include <fflas-ffpack/ffpack/ffpack.h>
using namespace LinBox;
using namespace std;
int main (int argc, char **argv)
{
if (argc < 3 || argc > 3) {
cerr << "Usage: echelon <matrix-file-in-SMS-format> <p>" << endl;
return -1;
}
ifstream input (argv[1]);
if (!input) { cerr << "Error opening matrix file " << argv[1] << endl; return -1; }
typedef Givaro::Modular<double> Field;
double q = atof(argv[2]);
Field F(q);
DenseMatrix<Field> A(F);
A.read(input);
DenseMatrix<Field> E(F,A.rowdim(),A.coldim());
cout << "A is " << A.rowdim() << " by " << A.coldim() << endl;
cout << A << std::endl;
#ifdef COMPARE_FFPACK
DenseMatrix<Field> G(A);
size_t * P = new size_t[G.coldim()];
size_t * Q = new size_t[G.rowdim()];
/* size_t r = (size_t)*/
FFPACK::ReducedRowEchelonForm (F, G.rowdim(), G.coldim(), G.getWritePointer(), G.coldim(), P, Q,false);
if (G.coldim() <20)
G.write(cerr<<"FFPACK::Echelon = "<<endl)<<endl;
delete[] P ;
delete[] Q ;
#endif
if (E.coldim() <20)
E.write(cerr<<"LinBox::Echelon = "<<endl)<<endl;
return 0;
}
// Local Variables:
// mode: C++
// tab-width: 8
// indent-tabs-mode: nil
// c-basic-offset: 8
// End:
// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s