1 /*
2 * This file is part of libsharp.
3 *
4 * libsharp is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * libsharp is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with libsharp; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /*
20 * libsharp is being developed at the Max-Planck-Institut fuer Astrophysik
21 * and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
22 * (DLR).
23 */
24
25 /*! \file sharp_almhelpers.c
26 * Spherical transform library
27 *
28 * Copyright (C) 2008-2011 Max-Planck-Society
29 * \author Martin Reinecke
30 */
31
32 #include "sharp_almhelpers.h"
33 #include "c_utils.h"
34
hpsharp_make_triangular_alm_info(int lmax,int mmax,int stride,hpsharp_alm_info ** alm_info)35 void hpsharp_make_triangular_alm_info (int lmax, int mmax, int stride,
36 hpsharp_alm_info **alm_info)
37 {
38 hpsharp_alm_info *info = RALLOC(hpsharp_alm_info,1);
39 info->lmax = lmax;
40 info->nm = mmax+1;
41 info->mval = RALLOC(int,mmax+1);
42 info->mvstart = RALLOC(ptrdiff_t,mmax+1);
43 info->stride = stride;
44 int tval = 2*lmax+1;
45 for (ptrdiff_t m=0; m<=mmax; ++m)
46 {
47 info->mval[m] = m;
48 info->mvstart[m] = stride*((m*(tval-m))>>1);
49 }
50 *alm_info = info;
51 }
52
hpsharp_make_rectangular_alm_info(int lmax,int mmax,int stride,hpsharp_alm_info ** alm_info)53 void hpsharp_make_rectangular_alm_info (int lmax, int mmax, int stride,
54 hpsharp_alm_info **alm_info)
55 {
56 hpsharp_alm_info *info = RALLOC(hpsharp_alm_info,1);
57 info->lmax = lmax;
58 info->nm = mmax+1;
59 info->mval = RALLOC(int,mmax+1);
60 info->mvstart = RALLOC(ptrdiff_t,mmax+1);
61 info->stride = stride;
62 for (ptrdiff_t m=0; m<=mmax; ++m)
63 {
64 info->mval[m] = m;
65 info->mvstart[m] = stride*m*(lmax+1);
66 }
67 *alm_info = info;
68 }
69