122 lines
3.6 KiB
C
122 lines
3.6 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, 2013 Sebastian Pancratz
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******************************************************************************/
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#include "fmpz_mat.h"
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#include "padic_mat.h"
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/*
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Assumptions:
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o That the matrix dimensions be compatible.
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o That the matrices be non-empty.
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o That ord_p(A) >= ord_p(B).
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*/
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void _padic_mat_sub(padic_mat_t C, const padic_mat_t A, const padic_mat_t B,
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const padic_ctx_t ctx)
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{
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if (padic_mat_is_zero(A))
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{
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padic_mat_neg(C, B, ctx);
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return;
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}
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if (padic_mat_is_zero(B))
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{
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padic_mat_set(C, A, ctx);
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return;
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}
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if (FLINT_MIN(padic_mat_val(A), padic_mat_val(B)) >= padic_mat_prec(C))
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{
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padic_mat_zero(C);
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return;
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}
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if (padic_mat_val(A) == padic_mat_val(B))
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{
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fmpz_mat_sub(padic_mat(C), padic_mat(A), padic_mat(B));
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padic_mat_val(C) = padic_mat_val(A);
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_padic_mat_canonicalise(C, ctx);
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}
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else
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{
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fmpz_t x;
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fmpz_init(x);
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if (padic_mat_val(A) < padic_mat_val(B))
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{
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fmpz_pow_ui(x, ctx->p, padic_mat_val(B) - padic_mat_val(A));
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if (C == A)
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{
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fmpz_mat_scalar_submul_fmpz(padic_mat(C), padic_mat(B), x);
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}
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else if (C == B)
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{
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fmpz_neg(x, x);
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fmpz_mat_scalar_mul_fmpz(padic_mat(C), padic_mat(B), x);
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fmpz_mat_add(padic_mat(C), padic_mat(A), padic_mat(C));
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padic_mat_val(C) = padic_mat_val(A);
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}
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else
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{
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fmpz_mat_set(padic_mat(C), padic_mat(A));
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fmpz_mat_scalar_submul_fmpz(padic_mat(C), padic_mat(B), x);
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padic_mat_val(C) = padic_mat_val(A);
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}
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}
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else /* A->val > B->val */
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{
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fmpz_pow_ui(x, ctx->p, padic_mat_val(A) - padic_mat_val(B));
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if (C == B)
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{
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fmpz_mat_scalar_submul_fmpz(padic_mat(C), padic_mat(A), x);
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fmpz_mat_neg(padic_mat(C), padic_mat(C));
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}
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else
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{
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fmpz_mat_scalar_mul_fmpz(padic_mat(C), padic_mat(A), x);
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fmpz_mat_sub(padic_mat(C), padic_mat(C), padic_mat(B));
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padic_mat_val(C) = padic_mat_val(B);
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}
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}
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fmpz_clear(x);
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}
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}
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void padic_mat_sub(padic_mat_t C, const padic_mat_t A, const padic_mat_t B,
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const padic_ctx_t ctx)
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{
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if (padic_mat_is_empty(C))
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{
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return;
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}
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_padic_mat_sub(C, A, B, ctx);
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_padic_mat_reduce(C, ctx);
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}
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