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/*
* examples/checksolve.C
*
* Copyright (C) 2007 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========
*/
/**\file examples/checksolve.C
* @example examples/checksolve.C
\brief Solving of sparse matrix over Z or Zp.
\ingroup examples
*/
#include <linbox/linbox-config.h>
#include <iostream>
#include <linbox/ring/modular.h>
#include <linbox/solutions/solve.h>
#include <linbox/util/matrix-stream.h>
#include <linbox/solutions/methods.h>
using namespace LinBox;
// using namespace std;
int main (int argc, char **argv)
{
// commentator().setMaxDetailLevel (-1);
// commentator().setMaxDepth (-1);
// commentator().setReportStream (std::cerr);
if (argc != 4) {
std::cerr << "Usage: checksolve <matrix-file-in-supported-format> <dense-vector-file> <p>" << std::endl;
return 0;
}
std::ifstream input (argv[1]);
if (!input) { std::cerr << "Error opening matrix file " << argv[1] << std::endl; return -1; }
std::ifstream invect(argv[2]);
if (!input) { std::cerr << "Error opening vector file " << argv[2] << std::endl; return -1; }
typedef Givaro::Modular<double> Field;
double q = atof(argv[3]);
Field F(q);
MatrixStream< Field > ms ( F, input );
DenseMatrix<Field> A (ms); // A.write(std::cout);
std::cout << "A is " << A.rowdim() << " by " << A.coldim() << std::endl;
DenseVector<Field> X(F, A.coldim()),B(F, A.rowdim());
for(DenseVector<Field>::iterator it=B.begin();
it != B.end(); ++it)
invect >> *it;
std::cout << "B is [ "<<B<< "]" << std::endl;
solve (X, A, B, Method::DenseElimination());
std::cout << "(DenseElimination) Solution is [ "<<X<< "]" << std::endl;
DenseVector<Field> r(F, A.rowdim());
BlasMatrixDomain<Field> BMD(F);
BMD.mul(r, static_cast<DenseMatrix<Field>& >(A), X);
//A.apply (r,X);
VectorDomain<Field> VD(F);
if (VD.areEqual (r,B))
std::cout<<"CHECK"<<std::endl;
else{
std::cout<<"FAIL"<<std::endl;
std::cout<<"r = "<<r<<std::endl;
std::cout<<"B = "<<B<<std::endl;
}
return 0;
}
// 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
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