mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ARB is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2014 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "acb_modular.h"
|
|
|
|
void
|
|
psl2z_inv(psl2z_t h, const psl2z_t g)
|
|
{
|
|
if (h != g)
|
|
psl2z_set(h, g);
|
|
|
|
if (fmpz_is_zero(&h->c) && fmpz_sgn(&h->a) > 0)
|
|
{
|
|
fmpz_neg(&h->b, &h->b);
|
|
fmpz_swap(&h->d, &h->a);
|
|
}
|
|
else
|
|
{
|
|
fmpz_swap(&h->a, &h->d);
|
|
fmpz_neg(&h->a, &h->a);
|
|
fmpz_neg(&h->d, &h->d);
|
|
}
|
|
}
|
|
|