mirror of
https://github.com/vale981/arb
synced 2025-03-05 17:31:38 -05:00
62 lines
1.8 KiB
C
62 lines
1.8 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) 2016 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "acb.h"
|
|
|
|
void
|
|
acb_sgn(acb_t res, const acb_t z, slong prec)
|
|
{
|
|
if (arb_is_zero(acb_imagref(z)))
|
|
{
|
|
arb_sgn(acb_realref(res), acb_realref(z));
|
|
arb_zero(acb_imagref(res));
|
|
}
|
|
else if (arb_is_zero(acb_realref(z)))
|
|
{
|
|
arb_sgn(acb_imagref(res), acb_imagref(z));
|
|
arb_zero(acb_realref(res));
|
|
}
|
|
else
|
|
{
|
|
arb_t t;
|
|
arb_init(t);
|
|
acb_abs(t, z, prec);
|
|
arb_inv(t, t, prec);
|
|
|
|
if (arb_is_finite(t))
|
|
{
|
|
acb_mul_arb(res, z, t, prec);
|
|
}
|
|
else
|
|
{
|
|
arf_zero(arb_midref(acb_realref(res)));
|
|
mag_one(arb_radref(acb_realref(res)));
|
|
arb_set(acb_imagref(res), acb_realref(res));
|
|
}
|
|
|
|
arb_clear(t);
|
|
}
|
|
}
|
|
|