linbox
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computes doubleDet.
/* -*- mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ // vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s /* * examples/doubledet.C * * Copyright (C) 2008, 2010 C. Pernet * * This file is part of 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 of * the License, or (at your option) any later version. * * LinBox 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 LinBox. If not, see * <http://www.gnu.org/licenses/>. */ #include <iostream> #include "linbox/linbox-config.h" #include "linbox/field/PID-integer.h" #include "linbox/util/matrix-stream.h" #include "linbox/solutions/det.h" #include "linbox/blackbox/blas-blackbox.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); PID_integer ZZ; ifstream input (argv[1]); if (!input) { cerr << "Error opening matrix file " << argv[1] << endl; return -1; } MatrixStream <PID_integer> ms (ZZ, input); BlasBlackbox <PID_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(); BlasBlackbox<PID_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 ; }