77 lines
2.2 KiB
C
77 lines
2.2 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 "fmpq_mat.h"
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int
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fmpq_mat_set_fmpz_mat_mod_fmpz(fmpq_mat_t X,
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const fmpz_mat_t Xmod, const fmpz_t mod)
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{
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fmpz_t num, den, t, u, d;
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slong i, j;
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int success = 1;
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fmpz_init(num);
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fmpz_init(den);
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fmpz_init(d);
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fmpz_init(t);
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fmpz_init(u);
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fmpz_one(d);
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for (i = 0; i < Xmod->r; i++)
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{
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for (j = 0; j < Xmod->c; j++)
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{
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/* TODO: handle various special cases efficiently; zeros,
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small integers, etc. */
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fmpz_mul(t, d, fmpz_mat_entry(Xmod, i, j));
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fmpz_fdiv_qr(u, t, t, mod);
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success = _fmpq_reconstruct_fmpz(num, den, t, mod);
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fmpz_mul(den, den, d);
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fmpz_set(d, den);
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if (!success)
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goto cleanup;
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fmpz_set(fmpq_mat_entry_num(X, i, j), num);
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fmpz_set(fmpq_mat_entry_den(X, i, j), den);
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fmpq_canonicalise(fmpq_mat_entry(X, i, j));
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}
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}
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cleanup:
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fmpz_clear(num);
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fmpz_clear(den);
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fmpz_clear(d);
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fmpz_clear(t);
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fmpz_clear(u);
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return success;
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}
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