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annotate libinterp/corefcn/sub2ind.cc @ 20207:4f45eaf83908 stable

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doc: Update more docstrings to have one sentence summary as first line. Reviewed libinterp/corefcn directory. * libinterp/corefcn/__ilu__.cc, libinterp/corefcn/balance.cc, libinterp/corefcn/besselj.cc, libinterp/corefcn/betainc.cc, libinterp/corefcn/bitfcns.cc, libinterp/corefcn/bsxfun.cc, libinterp/corefcn/cellfun.cc, libinterp/corefcn/colloc.cc, libinterp/corefcn/conv2.cc, libinterp/corefcn/data.cc, libinterp/corefcn/debug.cc, libinterp/corefcn/defaults.cc, libinterp/corefcn/det.cc, libinterp/corefcn/dirfns.cc, libinterp/corefcn/dlmread.cc, libinterp/corefcn/dot.cc, libinterp/corefcn/eig.cc, libinterp/corefcn/error.cc, libinterp/corefcn/fft2.cc, libinterp/corefcn/fftn.cc, libinterp/corefcn/file-io.cc, libinterp/corefcn/filter.cc, libinterp/corefcn/find.cc, libinterp/corefcn/gammainc.cc, libinterp/corefcn/gcd.cc, libinterp/corefcn/getgrent.cc, libinterp/corefcn/getpwent.cc, libinterp/corefcn/getrusage.cc, libinterp/corefcn/graphics.cc, libinterp/corefcn/help.cc, libinterp/corefcn/hex2num.cc, libinterp/corefcn/input.cc, libinterp/corefcn/inv.cc, libinterp/corefcn/kron.cc, libinterp/corefcn/load-path.cc, libinterp/corefcn/load-save.cc, libinterp/corefcn/lookup.cc, libinterp/corefcn/ls-oct-ascii.cc, libinterp/corefcn/lsode.cc, libinterp/corefcn/lu.cc, libinterp/corefcn/luinc.cc, libinterp/corefcn/mappers.cc, libinterp/corefcn/matrix_type.cc, libinterp/corefcn/max.cc, libinterp/corefcn/md5sum.cc, libinterp/corefcn/mgorth.cc, libinterp/corefcn/nproc.cc, libinterp/corefcn/oct-hist.cc, libinterp/corefcn/ordschur.cc, libinterp/corefcn/pager.cc, libinterp/corefcn/pinv.cc, libinterp/corefcn/pr-output.cc, libinterp/corefcn/pt-jit.cc, libinterp/corefcn/quad.cc, libinterp/corefcn/quadcc.cc, libinterp/corefcn/qz.cc, libinterp/corefcn/rand.cc, libinterp/corefcn/rcond.cc, libinterp/corefcn/regexp.cc, libinterp/corefcn/schur.cc, libinterp/corefcn/sighandlers.cc, libinterp/corefcn/sparse.cc, libinterp/corefcn/spparms.cc, libinterp/corefcn/str2double.cc, libinterp/corefcn/strfind.cc, libinterp/corefcn/strfns.cc, libinterp/corefcn/sub2ind.cc, libinterp/corefcn/svd.cc, libinterp/corefcn/symtab.cc, libinterp/corefcn/syscalls.cc, libinterp/corefcn/sysdep.cc, libinterp/corefcn/time.cc, libinterp/corefcn/toplev.cc, libinterp/corefcn/tril.cc, libinterp/corefcn/tsearch.cc, libinterp/corefcn/typecast.cc, libinterp/corefcn/urlwrite.cc, libinterp/corefcn/utils.cc, libinterp/corefcn/variables.cc, scripts/polynomial/spline.m: Update more docstrings to have one sentence summary as first line.
author Rik <rik@octave.org>
date Sat, 09 May 2015 17:19:30 -0700
parents 4197fc428c7d
children a9574e3c6e9e
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1 /*
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2
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3 Copyright (C) 2009-2015 VZLU Prague
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "Array-util.h"
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28 #include "oct-locbuf.h"
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29 #include "quit.h"
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30
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31 #include "defun.h"
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32 #include "error.h"
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33 #include "gripes.h"
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34 #include "oct-obj.h"
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35
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36
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37 static dim_vector
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38 get_dim_vector (const octave_value& val, const char *name)
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39 {
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40 RowVector dimsv = val.row_vector_value (false, true);
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41 dim_vector dv;
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42 octave_idx_type n = dimsv.length ();
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43
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44 if (n < 1)
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45 error ("%s: dimension vector DIMS must not be empty", name);
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46 else
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47 {
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48 dv.resize (std::max (n, static_cast<octave_idx_type> (2)));
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49 dv(1) = 1;
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50 for (octave_idx_type i = 0; i < n; i++)
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51 {
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52 octave_idx_type ii = dimsv(i);
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53 if (ii == dimsv(i) && ii >= 0)
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54 dv(i) = ii;
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55 else
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56 {
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57 error ("%s: dimension vector DIMS must contain integers", name);
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58 break;
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59 }
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60 }
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61 }
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62
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63 return dv;
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64 }
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65
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66 DEFUN (sub2ind, args, ,
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67 "-*- texinfo -*-\n\
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68 @deftypefn {Function File} {@var{ind} =} sub2ind (@var{dims}, @var{i}, @var{j})\n\
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69 @deftypefnx {Function File} {@var{ind} =} sub2ind (@var{dims}, @var{s1}, @var{s2}, @dots{}, @var{sN})\n\
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70 Convert subscripts to a linear index.\n\
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71 \n\
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72 The following example shows how to convert the two-dimensional index\n\
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73 @code{(2,3)} of a 3-by-3 matrix to a linear index. The matrix is linearly\n\
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74 indexed moving from one column to next, filling up all rows in each column.\n\
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75 \n\
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76 @example\n\
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77 @group\n\
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78 linear_index = sub2ind ([3, 3], 2, 3)\n\
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79 @result{} 8\n\
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80 @end group\n\
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81 @end example\n\
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82 @seealso{ind2sub}\n\
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83 @end deftypefn")
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84 {
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85 int nargin = args.length ();
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86 octave_value retval;
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87
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88 if (nargin < 2)
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89 print_usage ();
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90 else
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91 {
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92 dim_vector dv = get_dim_vector (args(0), "sub2ind");
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93 Array<idx_vector> idxa (dim_vector (nargin-1, 1));
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94
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95 if (! error_state)
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96 {
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97 dv = dv.redim (nargin - 1);
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98 for (int j = 0; j < nargin - 1; j++)
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99 {
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100 if (args(j+1).is_numeric_type ())
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101 {
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102 idxa(j) = args(j+1).index_vector ();
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103 if (error_state)
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104 break;
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105 else if (j > 0 && args(j+1).dims () != args(1).dims ())
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106 error ("sub2ind: all subscripts must be of the same size");
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107 }
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108 else
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109 error ("sub2ind: subscripts must be numeric");
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110
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111 if (error_state)
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112 break;
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113 }
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114 }
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115
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116 if (! error_state)
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117 {
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118 idx_vector idx = sub2ind (dv, idxa);
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119 retval = idx;
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120 }
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121 }
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122
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123 return retval;
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124 }
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125
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126 /*
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127 ## Test evaluation
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128 %!test
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129 %! s1 = [ 1 1 1 1 ; 2 2 2 2 ];
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130 %! s2 = [ 1 1 2 2 ; 1 1 2 2 ];
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131 %! s3 = [ 1 2 1 2 ; 1 2 1 2 ];
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132 %! in = [ 1 101 11 111 ; 2 102 12 112 ];
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133 %! assert (sub2ind ([10 10 10], s1, s2, s3), in);
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134
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135 # Test low index
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136 %!assert (sub2ind ([10 10 10], 1, 1, 1), 1)
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137 %!error <subscript indices> sub2ind ([10 10 10], 0, 1, 1)
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138 %!error <subscript indices> sub2ind ([10 10 10], 1, 0, 1)
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139 %!error <subscript indices> sub2ind ([10 10 10], 1, 1, 0)
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140
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141 # Test high index
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142 %!assert (sub2ind ([10 10 10], 10, 10, 10), 1000)
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143 %!error <index out of range> sub2ind ([10 10 10], 11, 10, 10)
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144 %!error <index out of range> sub2ind ([10 10 10], 10, 11, 10)
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145 %!error <index out of range> sub2ind ([10 10 10], 10, 10, 11)
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146
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147 # Test high index in the trailing dimensions
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148 %!assert (sub2ind ([10, 1], 2, 1, 1), 2)
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149 %!error <index out of range> sub2ind ([10, 1], 1, 2, 1)
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150 %!error <index out of range> sub2ind ([10, 1], 1, 1, 2)
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151 %!assert (sub2ind ([10 10], 2, 2, 1), 12)
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152 %!error <index out of range> sub2ind ([10 10], 2, 1, 2)
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153 %!error <index out of range> sub2ind ([10 10], 1, 2, 2)
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154
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155 # Test handling of empty arguments
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156 %!assert (sub2ind ([10 10], zeros (0,0), zeros (0,0)), zeros (0,0))
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157 %!assert (sub2ind ([10 10], zeros (2,0), zeros (2,0)), zeros (2,0))
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158 %!assert (sub2ind ([10 10], zeros (0,2), zeros (0,2)), zeros (0,2))
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159 %!error <all subscripts .* same size> sub2ind ([10 10 10], zeros (0,2), zeros (2,0))
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160
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161 # Test handling of arguments of different size
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162 %!error <all subscripts .* same size> sub2ind ([10 10], ones (1,2), ones (1,3))
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163 %!error <all subscripts .* same size> sub2ind ([10 10], ones (1,2), ones (2,1))
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164
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165 ## Test input validation
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166 %!error <dimension vector> sub2ind ([10 10.5], 1, 1)
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167 %!error <subscript indices> sub2ind ([10 10], 1.5, 1)
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168 %!error <subscript indices> sub2ind ([10 10], 1, 1.5)
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169 */
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170
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171 DEFUN (ind2sub, args, nargout,
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172 "-*- texinfo -*-\n\
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173 @deftypefn {Function File} {[@var{s1}, @var{s2}, @dots{}, @var{sN}] =} ind2sub (@var{dims}, @var{ind})\n\
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174 Convert a linear index to subscripts.\n\
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175 \n\
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176 The following example shows how to convert the linear index @code{8}\n\
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177 in a 3-by-3 matrix into a subscript. The matrix is linearly indexed\n\
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178 moving from one column to next, filling up all rows in each column.\n\
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179 \n\
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180 @example\n\
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181 @group\n\
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182 [r, c] = ind2sub ([3, 3], 8)\n\
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183 @result{} r = 2\n\
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184 @result{} c = 3\n\
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185 @end group\n\
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186 @end example\n\
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187 @seealso{sub2ind}\n\
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188 @end deftypefn")
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189 {
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190 int nargin = args.length ();
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191 octave_value_list retval;
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192
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193 if (nargin != 2)
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194 print_usage ();
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195 else
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196 {
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197 dim_vector dv = get_dim_vector (args(0), "ind2sub");
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198 idx_vector idx = args(1).index_vector ();
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199 if (! error_state)
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200 {
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201 if (nargout > dv.length ())
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202 dv = dv.redim (nargout);
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203
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204 Array<idx_vector> idxa = ind2sub (dv, idx);
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205 retval = Array<octave_value> (idxa);
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206 }
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207 }
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208
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209 return retval;
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210 }