Mercurial > octave-nkf

annotate src/DLD-FUNCTIONS/sub2ind.cc @ 10350:12884915a8e4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
merge MArray classes & improve Array interface
author Jaroslav Hajek <highegg@gmail.com>
date Sat, 23 Jan 2010 21:41:03 +0100
parents e317791645c4
children 89f4d7e294cc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
1 /*
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
2
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
3 Copyright (C) 2009 VZLU Prague
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
4
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
5 This file is part of Octave.
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
6
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
7 Octave is free software; you can redistribute it and/or modify it
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
8 under the terms of the GNU General Public License as published by the
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
9 Free Software Foundation; either version 3 of the License, or (at your
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
10 option) any later version.
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
11
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
12 Octave is distributed in the hope that it will be useful, but WITHOUT
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
15 for more details.
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
16
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
17 You should have received a copy of the GNU General Public License
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
18 along with Octave; see the file COPYING. If not, see
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
19 <http://www.gnu.org/licenses/>.
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
20
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
21 */
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
22
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
23 #ifdef HAVE_CONFIG_H
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
24 #include <config.h>
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
25 #endif
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
26
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
27 #include "quit.h"
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
28
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
29 #include "defun-dld.h"
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
30 #include "error.h"
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
31 #include "gripes.h"
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
32 #include "oct-obj.h"
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
33
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
34
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
35 static dim_vector
10258
e317791645c4 64-bit fixes
John W. Eaton <jwe@octave.org>
parents: 9666
diff changeset
36 get_dim_vector (const octave_value& val, const char *name)
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
37 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
38 RowVector dimsv = val.row_vector_value (false, true);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
39 dim_vector dv;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
40 octave_idx_type n = dimsv.length ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
41
9666
a531dec450c4 allow 1D case for sub2ind and ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents: 9479
diff changeset
42 if (n < 1)
a531dec450c4 allow 1D case for sub2ind and ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents: 9479
diff changeset
43 error ("%s: dimension vector must not be empty", name);
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
44 else
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
45 {
10258
e317791645c4 64-bit fixes
John W. Eaton <jwe@octave.org>
parents: 9666
diff changeset
46 dv.resize (std::max (n, static_cast<octave_idx_type> (2)));
9666
a531dec450c4 allow 1D case for sub2ind and ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents: 9479
diff changeset
47 dv(1) = 1;
a531dec450c4 allow 1D case for sub2ind and ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents: 9479
diff changeset
48 for (octave_idx_type i = 0; i < n; i++)
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
49 {
10258
e317791645c4 64-bit fixes
John W. Eaton <jwe@octave.org>
parents: 9666
diff changeset
50 octave_idx_type ii = dimsv(i);
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
51 if (ii == dimsv(i) && ii >= 0)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
52 dv(i) = ii;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
53 else
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
54 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
55 error ("%s: dimension vector must contain integers", name);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
56 break;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
57 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
58 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
59 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
60
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
61 return dv;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
62 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
63
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
64 DEFUN_DLD (sub2ind, args, ,
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
65 "-*- texinfo -*-\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
66 @deftypefn {Function File} {@var{ind} =} sub2ind (@var{dims}, @var{i}, @var{j})\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
67 @deftypefnx {Function File} {@var{ind} =} sub2ind (@var{dims}, @var{s1}, @var{s2}, @dots{}, @var{sN})\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
68 Convert subscripts into a linear index.\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
69 \n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
70 The following example shows how to convert the two-dimensional\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
71 index @code{(2,3)} of a 3-by-3 matrix to a linear index. The matrix\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
72 is linearly indexed moving from one column to next, filling up\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
73 all rows in each column.\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
74 \n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
75 @example\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
76 @group\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
77 linear_index = sub2ind ([3, 3], 2, 3)\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
78 @result{} 8\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
79 @end group\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
80 @end example\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
81 @seealso{ind2sub}\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
82 @end deftypefn")
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
83 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
84 int nargin = args.length ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
85 octave_value retval;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
86
9666
a531dec450c4 allow 1D case for sub2ind and ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents: 9479
diff changeset
87 if (nargin < 2)
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
88 print_usage ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
89 else
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
90 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
91 dim_vector dv = get_dim_vector (args(0), "sub2ind");
10350
12884915a8e4 merge MArray classes & improve Array interface
Jaroslav Hajek <highegg@gmail.com>
parents: 10258
diff changeset
92 Array<idx_vector> idxa (nargin - 1, 1);
9479
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
93
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
94 if (! error_state)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
95 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
96 dv = dv.redim (nargin - 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
97 for (int j = 0; j < nargin - 1; j++)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
98 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
99 if (args(j+1).is_numeric_type ())
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
100 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
101 idxa(j) = args(j+1).index_vector ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
102 if (error_state)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
103 break;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
104 else if (j > 0 && args(j+1).dims () != args(1).dims ())
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
105 error ("sub2ind: all subscripts must be of the same size");
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
106 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
107 else
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
108 error ("sub2ind: subscripts must be numeric");
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
109
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
110 if (error_state)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
111 break;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
112 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
113 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
114
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
115 if (! error_state)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
116 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
117 idx_vector idx = sub2ind (dv, idxa);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
118 retval = idx;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
119 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
120 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
121
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
122 return retval;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
123 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
124
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
125 /*
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
126
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
127 # Test input validation
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
128 %!error <sub2ind: dimension vector .*> sub2ind([10 10.5], 1, 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
129 %!error <subscript indices .*> sub2ind([10 10], 1.5, 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
130 %!error <subscript indices .*> sub2ind([10 10], 1, 1.5);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
131
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
132 # Test evaluation
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
133 %!shared s1, s2, s3, in
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
134 %! s1 = [ 1 1 1 1 ; 2 2 2 2 ];
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
135 %! s2 = [ 1 1 2 2 ; 1 1 2 2 ];
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
136 %! s3 = [ 1 2 1 2 ; 1 2 1 2 ];
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
137 %! in = [ 1 101 11 111 ; 2 102 12 112 ];
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
138 %!assert (sub2ind([10 10 10], s1, s2, s3), in);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
139 %!shared
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
140
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
141 # Test low index
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
142 %!assert (sub2ind([10 10 10], 1, 1, 1), 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
143 %!error <subscript indices .*> sub2ind([10 10 10], 0, 1, 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
144 %!error <subscript indices .*> sub2ind([10 10 10], 1, 0, 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
145 %!error <subscript indices .*> sub2ind([10 10 10], 1, 1, 0);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
146
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
147 # Test high index
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
148 %!assert (sub2ind([10 10 10], 10, 10, 10), 1000);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
149 %!error <sub2ind: index out of range> sub2ind([10 10 10], 11, 10, 10);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
150 %!error <sub2ind: index out of range> sub2ind([10 10 10], 10, 11, 10);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
151 %!error <sub2ind: index out of range> sub2ind([10 10 10], 10, 10, 11);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
152
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
153 # Test high index in the trailing dimensions
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
154 %!assert (sub2ind([10, 1], 2, 1, 1), 2);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
155 %!error <sub2ind: index out of range> sub2ind([10, 1], 1, 2, 1);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
156 %!error <sub2ind: index out of range> sub2ind([10, 1], 1, 1, 2);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
157 %!assert (sub2ind([10 10], 2, 2, 1), 12);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
158 %!error <sub2ind: index out of range> sub2ind([10 10], 2, 1, 2);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
159 %!error <sub2ind: index out of range> sub2ind([10 10], 1, 2, 2);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
160
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
161 # Test handling of empty arguments
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
162 %!assert (sub2ind([10 10], zeros(0,0), zeros(0,0)), zeros(0,0));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
163 %!assert (sub2ind([10 10], zeros(2,0), zeros(2,0)), zeros(2,0));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
164 %!assert (sub2ind([10 10], zeros(0,2), zeros(0,2)), zeros(0,2));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
165 %!error <sub2ind: all subscripts .* same size> sub2ind([10 10 10], zeros(0,2), zeros(2,0));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
166
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
167 # Test handling of arguments of different size
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
168 %!error <sub2ind: all subscripts .* same size> sub2ind([10 10], ones(1,2), ones(1,3));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
169 %!error <sub2ind: all subscripts .* same size> sub2ind([10 10], ones(1,2), ones(2,1));
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
170
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
171 */
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
172
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
173 DEFUN_DLD (ind2sub, args, nargout,
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
174 "-*- texinfo -*-\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
175 @deftypefn {Function File} {[@var{s1}, @var{s2}, @dots{}, @var{sN}] =} ind2sub (@var{dims}, @var{ind})\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
176 Convert a linear index into subscripts.\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
177 \n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
178 The following example shows how to convert the linear index @code{8}\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
179 in a 3-by-3 matrix into a subscript. The matrix is linearly indexed\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
180 moving from one column to next, filling up all rows in each column.\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
181 @example\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
182 @group\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
183 [r, c] = ind2sub ([3, 3], 8)\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
184 @result{} r = 2\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
185 c = 3\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
186 @end group\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
187 @end example\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
188 @seealso{sub2ind}\n\
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
189 @end deftypefn")
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
190 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
191 int nargin = args.length ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
192 octave_value_list retval;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
193
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
194 if (nargin != 2)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
195 print_usage ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
196 else
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
197 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
198 dim_vector dv = get_dim_vector (args(0), "ind2sub");
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
199 idx_vector idx = args(1).index_vector ();
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
200 if (! error_state)
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
201 {
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
202 if (nargout > dv.length ())
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
203 dv = dv.redim (nargout);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
204
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
205 Array<idx_vector> idxa = ind2sub (dv, idx);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
206 retval = Array<octave_value> (idxa);
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
207 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
208 }
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
209
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
210 return retval;
d9716e3ee0dd supply optimized compiled sub2ind & ind2sub
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
211 }