95 lines
3.2 KiB
C
95 lines
3.2 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) 2012, 2013 Sebastian Pancratz
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******************************************************************************/
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#include <limits.h>
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#include "padic_mat.h"
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void padic_mat_set_fmpq_mat(padic_mat_t B,
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const fmpq_mat_t A, const padic_ctx_t ctx)
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{
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if (!fmpq_mat_is_empty(A))
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{
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const slong N = padic_mat_prec(B);
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slong i, j, m = WORD_MAX, v, w;
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fmpz_t f, g, s, t;
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fmpz_init(f);
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fmpz_init(g);
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fmpz_init(s);
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fmpz_init(t);
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/* Find min valuation m */
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for (i = 0; i < A->r; i++)
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for (j = 0; j < A->c; j++)
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if (!fmpq_is_zero(fmpq_mat_entry(A, i, j)))
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{
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v = fmpz_remove(t, fmpq_mat_entry_num(A, i, j), ctx->p);
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w = fmpz_remove(t, fmpq_mat_entry_den(A, i, j), ctx->p);
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m = FLINT_MIN(m, v - w);
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}
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if (m >= N)
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{
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padic_mat_zero(B);
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}
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else
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{
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for (i = 0; i < A->r; i++)
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for (j = 0; j < A->c; j++)
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if (fmpq_is_zero(fmpq_mat_entry(A, i, j)))
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{
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fmpz_zero(padic_mat_entry(B, i, j));
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}
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else
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{
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v = fmpz_remove(s, fmpq_mat_entry_num(A, i, j), ctx->p);
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w = fmpz_remove(t, fmpq_mat_entry_den(A, i, j), ctx->p);
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if (v - w >= N)
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{
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fmpz_zero(padic_mat_entry(B, i, j));
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}
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else
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{
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fmpz_pow_ui(f, ctx->p, (v - w) - m);
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fmpz_pow_ui(g, ctx->p, N - (v - w));
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_padic_inv(t, t, ctx->p, N - (v - w));
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fmpz_mul(padic_mat_entry(B, i, j), s, t);
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fmpz_mod(padic_mat_entry(B, i, j), padic_mat_entry(B, i, j), g);
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fmpz_mul(padic_mat_entry(B, i, j), padic_mat_entry(B, i, j), f);
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}
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}
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padic_mat_val(B) = m;
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}
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fmpz_clear(f);
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fmpz_clear(g);
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fmpz_clear(s);
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fmpz_clear(t);
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}
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}
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