arb/fmpz_holonomic/normalise_sign.c

43 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) 2012 Fredrik Johansson
******************************************************************************/
#include "fmpz_holonomic.h"
void
fmpz_holonomic_normalise_sign(fmpz_holonomic_t op)
{
if (op->length > 0)
{
long i;
fmpz_poly_struct * poly = op->coeffs + op->length - 1;
if (fmpz_sgn(poly->coeffs + poly->length - 1) < 0)
{
for (i = 0; i < op->length; i++)
fmpz_poly_neg(op->coeffs + i, op->coeffs + i);
}
}
}