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/* spprop.c
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*
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* Copyright (C) 2014 Patrick Alken
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <gsl/gsl_spmatrix.h>
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#include <gsl/gsl_errno.h>
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/*
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gsl_spmatrix_equal()
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Return 1 if a = b, 0 otherwise
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*/
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int
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gsl_spmatrix_equal(const gsl_spmatrix *a, const gsl_spmatrix *b)
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{
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const size_t M = a->size1;
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const size_t N = a->size2;
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if (b->size1 != M || b->size2 != N)
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{
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GSL_ERROR_VAL("matrices must have same dimensions", GSL_EBADLEN, 0);
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}
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else if (a->sptype != b->sptype)
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{
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GSL_ERROR_VAL("trying to compare different sparse matrix types", GSL_EINVAL, 0);
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}
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else
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{
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const size_t nz = a->nz;
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size_t n;
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if (nz != b->nz)
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return 0; /* different number of non-zero elements */
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if (GSL_SPMATRIX_ISTRIPLET(a))
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{
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/*
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* triplet formats could be out of order but identical, so use
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* gsl_spmatrix_get() on b for each aij
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*/
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for (n = 0; n < nz; ++n)
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{
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double bij = gsl_spmatrix_get(b, a->i[n], a->p[n]);
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if (a->data[n] != bij)
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return 0;
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}
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}
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else if (GSL_SPMATRIX_ISCCS(a))
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{
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/*
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* for CCS, both matrices should have everything
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* in the same order
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*/
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/* check row indices and data */
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for (n = 0; n < nz; ++n)
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{
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if ((a->i[n] != b->i[n]) || (a->data[n] != b->data[n]))
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return 0;
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}
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/* check column pointers */
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for (n = 0; n < a->size2 + 1; ++n)
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{
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if (a->p[n] != b->p[n])
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return 0;
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}
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}
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else if (GSL_SPMATRIX_ISCRS(a))
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{
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/*
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* for CRS, both matrices should have everything
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* in the same order
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*/
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/* check column indices and data */
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for (n = 0; n < nz; ++n)
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{
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if ((a->i[n] != b->i[n]) || (a->data[n] != b->data[n]))
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return 0;
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}
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/* check row pointers */
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for (n = 0; n < a->size1 + 1; ++n)
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{
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if (a->p[n] != b->p[n])
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return 0;
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}
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}
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else
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{
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GSL_ERROR_VAL("unknown sparse matrix type", GSL_EINVAL, 0);
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}
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return 1;
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}
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} /* gsl_spmatrix_equal() */
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