61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT 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 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Fredrik Johansson
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******************************************************************************/
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#include "fmpq_mat.h"
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void fmpq_mat_mul_direct(fmpq_mat_t C, const fmpq_mat_t A, const fmpq_mat_t B)
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{
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slong i, j, k;
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if (A == C || B == C)
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{
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flint_printf("Exception (fmpq_mat_mul_direct). Aliasing not implemented.\n");
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abort();
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}
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if (A->c == 0)
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{
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fmpq_mat_zero(C);
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return;
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}
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for (i = 0; i < A->r; i++)
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{
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for (j = 0; j < B->c; j++)
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{
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fmpq_mul(fmpq_mat_entry(C, i, j),
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fmpq_mat_entry(A, i, 0),
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fmpq_mat_entry(B, 0, j));
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for (k = 1; k < A->c; k++)
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{
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fmpq_addmul(fmpq_mat_entry(C, i, j),
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fmpq_mat_entry(A, i, k),
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fmpq_mat_entry(B, k, j));
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}
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}
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}
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}
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