1 /* vector/subvector_source.c
2 *
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19
QUALIFIED_VIEW(_gsl_vector,view)20 QUALIFIED_VIEW(_gsl_vector, view)
21 FUNCTION(gsl_vector, subvector) (QUALIFIED_TYPE(gsl_vector) * v, size_t offset, size_t n)
22 {
23 QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;
24
25 if (n == 0)
26 {
27 GSL_ERROR_VAL ("vector length n must be positive integer",
28 GSL_EINVAL, view);
29 }
30
31 if (offset + (n - 1) >= v->size)
32 {
33 GSL_ERROR_VAL ("view would extend past end of vector",
34 GSL_EINVAL, view);
35 }
36
37 {
38 TYPE(gsl_vector) s = NULL_VECTOR;
39
40 s.data = v->data + MULTIPLICITY * v->stride * offset ;
41 s.size = n;
42 s.stride = v->stride;
43 s.block = v->block;
44 s.owner = 0;
45
46 view.vector = s;
47 return view;
48 }
49 }
50
QUALIFIED_VIEW(_gsl_vector,view)51 QUALIFIED_VIEW(_gsl_vector, view)
52 FUNCTION(gsl_vector, subvector_with_stride) (QUALIFIED_TYPE(gsl_vector) * v, size_t offset, size_t stride, size_t n)
53 {
54 QUALIFIED_VIEW(_gsl_vector,view) view = NULL_VECTOR_VIEW;
55
56 if (n == 0)
57 {
58 GSL_ERROR_VAL ("vector length n must be positive integer",
59 GSL_EINVAL, view);
60 }
61
62 if (stride == 0)
63 {
64 GSL_ERROR_VAL ("stride must be positive integer",
65 GSL_EINVAL, view);
66 }
67
68 if (offset + (n - 1) * stride >= v->size)
69 {
70 GSL_ERROR_VAL ("view would extend past end of vector",
71 GSL_EINVAL, view);
72 }
73
74 {
75 TYPE(gsl_vector) s = NULL_VECTOR;
76
77 s.data = v->data + MULTIPLICITY * v->stride * offset ;
78 s.size = n;
79 s.stride = v->stride * stride;
80 s.block = v->block;
81 s.owner = 0;
82
83 view.vector = s;
84 return view;
85 }
86 }
87