linbox
examples/mpidet.C

Determinant of sparse matrix over Z or Zp.

/*
* examples/mpidet.C
*
* Copyright (C) 2006, 2010 B Youse, D Saunders
* ========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 <string>
#include <linbox/util/matrix-stream.h>
using namespace LinBox;
using namespace std;
int main (int argc, char **argv)
{
#ifdef __LINBOX_HAVE_MPI
if (argc < 2) {
cerr << "Usage: det <matrix-file-in-supported-format>" << endl;
return -1;
}
// ex: ./det [matrix-file]
else{
// For a small integer matrix test, do "make mpidet2 -f makefile.mpi"
// set up parallel code object
Communicator *Cptr = NULL;
Cptr = new Communicator(&argc, &argv);
typedef Givaro::ZRing<Integer> Integers;
Integers ZZ;
ifstream input (argv[1]);
if (!input)
{ cerr << "Error opening matrix file " << argv[1] << endl;
return -1;
}
SparseMatrix<Integers>A(ZZ);
A.read(input);
if(!Cptr->rank()){
cout << "A is " << A.rowdim() << " by " << A.coldim() << endl;
cout << "Beginning parallel computation with " << Cptr->size()
<< " processes." << endl;
}
Integers::Element det_A;
// call parallel det with cra
cra_det(det_A, A, RingCategories::IntegerTag(), Method::Hybrid(*Cptr), Cptr);
// if parent process, report the determinant
if(!Cptr->rank()){
cout << "Determinant is ";
ZZ.write(cout, det_A) << endl;
}
// tie up parallel loose ends if necessary
MPI_Finalize();
}
return 0;
#else
cerr << "Compile with -D__LINBOX_HAVE_MPI" << endl;
return -1 ;
#endif
}
// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,:0,t0,+0,=s
// Local Variables:
// mode: C++
// tab-width: 8
// indent-tabs-mode: nil
// c-basic-offset: 8
// End: