58 lines
1.6 KiB
C
58 lines
1.6 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 "fmpz_mat.h"
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void
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fmpz_mat_det_bound(fmpz_t bound, const fmpz_mat_t A)
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{
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fmpz_t p, s, t;
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slong i, j;
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fmpz_init(p);
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fmpz_init(s);
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fmpz_init(t);
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fmpz_one(p);
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for (i = 0; i < A->r; i++)
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{
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fmpz_zero(s);
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for (j = 0; j < A->c; j++)
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fmpz_addmul(s, A->rows[i] + j, A->rows[i] + j);
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fmpz_sqrtrem(s, t, s);
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if (!fmpz_is_zero(t))
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fmpz_add_ui(s, s, UWORD(1));
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fmpz_mul(p, p, s);
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}
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fmpz_set(bound, p);
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fmpz_clear(p);
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fmpz_clear(s);
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fmpz_clear(t);
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}
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