71 lines
2.1 KiB
C
71 lines
2.1 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 <stdlib.h>
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#include "flint.h"
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#include "fmpz_poly.h"
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#include "fmpz_poly_mat.h"
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static void
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binary_splitting(fmpz_poly_mat_t P, fmpz_poly_mat_t * const factors,
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slong n1, slong n2)
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{
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if (n2 - n1 <= 0)
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{
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fmpz_poly_mat_one(P);
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}
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else if (n2 - n1 == 1)
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{
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fmpz_poly_mat_set(P, factors[n1]);
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}
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else if (n2 - n1 == 2)
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{
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fmpz_poly_mat_mul(P, factors[n1], factors[n1 + 1]);
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}
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else
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{
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fmpz_poly_mat_t P1, P2;
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slong m = (n1 + n2) / 2;
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fmpz_poly_mat_init(P1, P->r, P->c);
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fmpz_poly_mat_init(P2, P->r, P->c);
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binary_splitting(P1, factors, n1, m);
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binary_splitting(P2, factors, m, n2);
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fmpz_poly_mat_mul(P, P1, P2);
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fmpz_poly_mat_clear(P1);
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fmpz_poly_mat_clear(P2);
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}
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}
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void
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fmpz_poly_mat_prod(fmpz_poly_mat_t res,
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fmpz_poly_mat_t * const factors, slong n)
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{
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binary_splitting(res, factors, 0, n);
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}
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