linbox
examples/doubledet.C

computes doubleDet.

/*
* examples/doubledet.C
*
* Copyright (C) 2008, 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 <givaro/zring.h>
#include <linbox/util/matrix-stream.h>
#include <linbox/algorithms/double-det.h>
using namespace LinBox;
using namespace std;
int main (int argc, char **argv)
{
// commentator().setMaxDetailLevel (-1);
// commentator().setMaxDepth (-1);
// commentator().setReportStream (std::cerr);
Givaro::ZRing<Integer> ZZ;
ifstream input (argv[1]);
if (!input)
{ cerr << "Error opening matrix file " << argv[1] << endl;
return -1;
}
DenseMatrix <Givaro::ZRing<Integer> > A (ms);
cout << "Matrix is " << A.rowdim() << " by " << A.coldim() << endl;
if (A.rowdim() != A.coldim() + 1){
cerr<<"Wrong dimensions: A must be (n+1) x n"<<endl;
exit (-1);
}
integer det1, det2;
Timer tim; tim.clear();
tim.start();
bool proof=false;
if (argc > 2)
proof = true;
//doubleDet (det1, det2, A, true);
doubleDet (det1, det2, A, proof);
tim.stop();
// Check solution
size_t n = A.coldim();
DenseMatrix<Givaro::ZRing<Integer> > B (ZZ, n, n);
for (size_t i=0; i<n-1; ++i)
for (size_t j=0; j<n; ++j)
B.setEntry (i,j,A.getEntry(i,j));
for (size_t j=0; j<n; ++j)
B.setEntry (n-1,j,A.getEntry(n-1,j));
integer db, dc;
det (db, B);
for (size_t j=0; j<n; ++j)
B.setEntry(n-1,j,A.getEntry(n,j));
Timer tim2;
tim2.clear();
tim2.start();
det(dc, B);
tim2.stop();
if ((det1 != db) || (det2 != dc))
std::cerr<<"Check FAIL"<<endl;
cout<< "Det 1 = " << det1 << endl;
cout<< "Det 2 = " << det2 << endl;
cerr << "Double Det: " << tim.usertime() << "s" << endl;
cerr << "Each single Det: "<<tim2.usertime() << "s" << 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