60 lines
1.9 KiB
C
60 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) 2010, 2011 Sebastian Pancratz
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******************************************************************************/
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#include "fmpz_poly_q.h"
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void fmpz_poly_q_inv(fmpz_poly_q_t rop, const fmpz_poly_q_t op)
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{
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if (fmpz_poly_is_zero(op->num))
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{
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flint_printf("Exception (fmpz_poly_q_inv). Zero is not invertible.\n");
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abort();
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}
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if (rop == op)
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{
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fmpz_poly_swap(rop->num, rop->den);
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if (fmpz_sgn(fmpz_poly_lead(rop->den)) < 0)
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{
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fmpz_poly_neg(rop->num, rop->num);
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fmpz_poly_neg(rop->den, rop->den);
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}
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}
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else
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{
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if (fmpz_sgn(fmpz_poly_lead(op->num)) > 0)
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{
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fmpz_poly_set(rop->num, op->den);
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fmpz_poly_set(rop->den, op->num);
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}
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else
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{
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fmpz_poly_neg(rop->num, op->den);
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fmpz_poly_neg(rop->den, op->num);
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}
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}
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}
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