arb/acb_dirichlet/vec_set_null.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"

void
acb_dirichlet_vec_set_null(ulong *v, ulong nv, const acb_dirichlet_group_t G)
{
    ulong k, l;
    if (G->q_even > 1)
    {
        for (k = 2; k < nv; k += 2)
            v[k] = -1;
    }

    for (l = 0; l < G->num; l++)
    {
        ulong p = G->primes[l];

        for (k = p; k < nv; k += p)
            v[k] = ACB_DIRICHLET_CHI_NULL;
    }
}