mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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Copyright (C) 2016 Pascal Molin
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "acb_dirichlet.h"
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/* dft, lexicographic conrey indexing, array size G->phi_q */
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void
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acb_dirichlet_dft_conrey(acb_ptr w, acb_srcptr v, const acb_dirichlet_group_t G, slong prec)
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{
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slong k, l, * cyc;
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cyc = flint_malloc(G->num * sizeof(slong));
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for (k = 0, l = G->num - 1; l >= 0; k++, l--)
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cyc[k] = G->P[k].phi;
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acb_dirichlet_dft_prod(w, v, cyc, G->num, prec);
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flint_free(cyc);
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}
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/* dft, number indexing, array size G->q */
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void
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acb_dirichlet_dft(acb_ptr w, acb_srcptr v, const acb_dirichlet_group_t G, slong prec)
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{
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ulong i, len;
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acb_ptr t1, t2;
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acb_dirichlet_conrey_t x;
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len = G->phi_q;
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t1 = flint_malloc(len * sizeof(acb_struct));
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acb_dirichlet_conrey_init(x, G);
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acb_dirichlet_conrey_one(x, G);
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for (i = 0; i < len; i++)
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{
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t1[i] = v[x->n];
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acb_dirichlet_conrey_next(x, G);
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};
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t2 = _acb_vec_init(len);
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acb_dirichlet_dft_conrey(t2, t1, G, prec);
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acb_dirichlet_conrey_one(x, G);
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for (i = 0; i < len; i++)
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{
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acb_set(w + x->n, t2 + i);
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acb_dirichlet_conrey_next(x, G);
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};
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_acb_vec_clear(t2, len);
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acb_dirichlet_conrey_clear(x);
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flint_free(t1);
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}
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