arb/acb_dirichlet/char_next.c
2016-09-06 14:33:16 +02:00

49 lines
1.6 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 Pascal Molin
******************************************************************************/
#include "acb_dirichlet.h"
int
acb_dirichlet_char_next(acb_dirichlet_char_t chi, const acb_dirichlet_group_t G)
{
ulong k;
acb_dirichlet_char_denormalize(chi, G);
/* update index */
for (k=0; k < G->num ; k++)
{
chi->n = nmod_mul(chi->n, G->generators[k], G->mod);
chi->expo[k] += G->PHI[k];
if (chi->expo[k] < G->expo)
break;
chi->expo[k] = 0;
}
acb_dirichlet_char_normalize(chi, G);
/* return last index modified */
return k;
}