63 lines
1.9 KiB
C
63 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 "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_det(nmod_poly_t det, const nmod_poly_mat_t A)
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{
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slong n = A->r;
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if (n == 0)
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{
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nmod_poly_one(det);
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}
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else if (n == 1)
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{
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nmod_poly_set(det, nmod_poly_mat_entry(A, 0, 0));
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}
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else if (n == 2)
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{
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nmod_poly_t tmp;
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nmod_poly_init(tmp, nmod_poly_mat_modulus(A));
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nmod_poly_mul(det, nmod_poly_mat_entry(A, 0, 0),
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nmod_poly_mat_entry(A, 1, 1));
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nmod_poly_mul(tmp, nmod_poly_mat_entry(A, 0, 1),
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nmod_poly_mat_entry(A, 1, 0));
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nmod_poly_sub(det, det, tmp);
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nmod_poly_clear(tmp);
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}
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else if (n < 15) /* should be entry sensitive too */
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{
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nmod_poly_mat_det_fflu(det, A);
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}
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else
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{
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nmod_poly_mat_det_interpolate(det, A);
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}
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}
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