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========
 */

#define __LINBOX_HAVE_MPI
#include"linbox/linbox-config.h"
#include"mpi.h"

#include <iostream>
#include <string>

#include <linbox/ring/modular.h>
#include <linbox/matrix/sparse-matrix.h>
#include <linbox/solutions/det.h>
#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::Auto(*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
}

// Local Variables:
// mode: C++
// tab-width: 4
// indent-tabs-mode: nil
// c-basic-offset: 4
// End:
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