81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/*=============================================================================
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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 "flint.h"
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#include "nmod_poly.h"
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#include "nmod_poly_mat.h"
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void
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nmod_poly_mat_mul_classical(nmod_poly_mat_t C, const nmod_poly_mat_t A,
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const nmod_poly_mat_t B)
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{
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slong ar, bc, br;
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slong i, j, k;
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nmod_poly_t t;
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ar = A->r;
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br = B->r;
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bc = B->c;
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if (br == 0 || ar == 0 || bc == 0)
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{
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nmod_poly_mat_zero(C);
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return;
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}
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if (C == A || C == B)
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{
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nmod_poly_mat_t T;
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nmod_poly_mat_init(T, ar, bc, nmod_poly_mat_modulus(A));
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nmod_poly_mat_mul_classical(T, A, B);
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nmod_poly_mat_swap(C, T);
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nmod_poly_mat_clear(T);
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return;
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}
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nmod_poly_init(t, nmod_poly_mat_modulus(A));
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for (i = 0; i < ar; i++)
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{
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for (j = 0; j < bc; j++)
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{
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nmod_poly_mul(nmod_poly_mat_entry(C, i, j),
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nmod_poly_mat_entry(A, i, 0),
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nmod_poly_mat_entry(B, 0, j));
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for (k = 1; k < br; k++)
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{
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nmod_poly_mul(t, nmod_poly_mat_entry(A, i, k),
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nmod_poly_mat_entry(B, k, j));
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nmod_poly_add(nmod_poly_mat_entry(C, i, j),
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nmod_poly_mat_entry(C, i, j), t);
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}
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}
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}
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nmod_poly_clear(t);
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}
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