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annotate scripts/miscellaneous/orderfields.m @ 10285:22a7913bbeb5

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optimize return values of find and sort
author Jaroslav Hajek <highegg@gmail.com>
date Tue, 09 Feb 2010 12:56:47 +0100
parents 9d1a14e12431
children 95c3e38098bf
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2006, 2007, 2009 Paul Kienzle
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{t}, @var{p}] =} orderfields (@var{s1}[, @var{s2}])
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21 ## Return a copy of @var{s1} with fields arranged alphabetically or
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22 ## as specified by @var{s2}.
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23 ##
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24 ## Given one struct, arrange field names in @var{s1} alphabetically.
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25 ##
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26 ## If the second argument is a struct, arrange field names in @var{s1}
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27 ## as they appear in @var{s2}. The second argument may also specify the
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28 ## order in a permutation vector or a cell array of strings containing
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29 ## the fieldnames of @var{s1} in the desired order.
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30 ##
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31 ## The optional second output argument @var{p} is assigned the permutation vector
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32 ## which converts the original name order into the new name order.
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33 ##
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34 ## Examples:
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35 ##
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36 ## @example
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37 ## @group
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38 ## s = struct("d", 4, "b", 2, "a", 1, "c", 3);
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39 ## t1 = orderfields(s)
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40 ## @result{} t1 =
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41 ## @{
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42 ## a = 1
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43 ## b = 2
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44 ## c = 3
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45 ## d = 4
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46 ## @}
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47 ## @end group
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48 ## @group
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49 ## t = struct("d", @{@}, "c", @{@}, "b", "a", @{@});
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50 ## t2 = orderfields(s, t)
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51 ## @result{} t2 =
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52 ## @{
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53 ## d = 4
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54 ## c = 3
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55 ## b = 2
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56 ## a = 1
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57 ## @}
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58 ## @end group
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59 ## @group
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60 ## t3 = orderfields(s, [3, 2, 4, 1]);
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61 ## @result{} t3 =
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62 ## @{
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63 ## a = 1
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64 ## b = 2
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65 ## c = 3
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66 ## d = 4
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67 ## @}
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68 ## @end group
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69 ## @group
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70 ## [t4, p] = orderfields(s, @{"d", "c", "b", "a"@})
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71 ## @result{} t4 = @{
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72 ## d = 4
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73 ## c = 3
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74 ## b = 2
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75 ## a = 1
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76 ## @}
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77 ## p =
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78 ## 1
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79 ## 4
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80 ## 2
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81 ## 3
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82 ## @end group
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83 ## @end example
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84 ##
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85 ## @seealso{getfield, rmfield, isfield, isstruct, fieldnames, struct}
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86 ## @end deftypefn
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87
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88 ## Author: Paul Kienzle <pkienzle@users.sf.net>
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89 ## Adapted-By: jwe
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90
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91 function [t, p] = orderfields (s1, s2)
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92
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93 if (nargin == 1 || nargin == 2)
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94 if (! isstruct (s1))
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95 error ("orderfields: expecting argument to be a struct");
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96 endif
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97 else
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98 print_usage ();
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99 endif
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100
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101 if (nargin == 1)
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102 ## One structure: return the fields in alphabetical order.
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103 if (isstruct (s1))
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104 names = sort (fieldnames (s1));
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105 endif
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106 elseif (nargin == 2)
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107 if (isstruct (s2))
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108 ## Two structures: return the fields in the order of s2.
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109 names = fieldnames (s2);
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110 if (! isequal (sort (fieldnames (s1)), sort (names)))
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111 error ("orderfields: structures do not have same fields");
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112 endif
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113 elseif (iscellstr (s2))
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114 ## A structure and a list of fields: order by the list of fields.
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115 t1 = sort (fieldnames (s1));
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116 t2 = sort (s2(:));
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117 if (! isequal (t1, t2))
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118 error ("orderfields: name list does not match structure fields");
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119 endif
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120 names = s2;
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121 elseif (isvector (s2))
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122 ## A structure and a permutation vector: permute the order of s1.
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123 names = fieldnames (s1);
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124 t1 = sort (s2);
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125 t1 = t1(:)';
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126 t2 = 1:numel (names);
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127 if (! isequal (t1, t2))
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128 error ("orderfields: invalid permutation vector");
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129 endif
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130 names = names (s2);
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131 endif
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132 endif
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133
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134 ## Find permutation vector which converts the original name order
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135 ## into the new name order. Note: could save a couple of sorts
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136 ## in some cases, but performance isn't critical.
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137
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138 if (nargout == 2)
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139 [oldel, oldidx] = sort (fieldnames (s1));
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140 [newel, newidx] = sort (names);
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141 p = oldidx(newidx);
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142 endif
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143
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144 ## Permute the names in the structure.
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145 if (numel (s1) == 0)
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146 args = cell (1, 2 * numel (names));
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147 args(1:2:end) = names;
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148 args(2:2:end) = {[]};
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149 t = struct (args{:});
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150 else
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151 n = numel (s1);
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152 for i = 1:numel (names)
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153 el = names(i);
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154 [t(1:n).(el)] = s1(:).(el);
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155 endfor
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156 ## inherit dimensions
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157 t = reshape (t, size (s1));
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158 endif
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159
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160 endfunction
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161
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162 %!shared a, b, c
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163 %! a = struct ("foo", {1, 2}, "bar", {3, 4});
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164 %! b = struct ("bar", 6, "foo", 5);
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165 %! c = struct ("bar", {7, 8}, "foo", 9);
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166 %!test
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167 %! a(2) = orderfields (b, a);
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168 %! assert (a(2).foo, 5)
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169 %! assert (a(2).bar, 6)
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170 %!test
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171 %! [a(2), p] = orderfields (b, [2 1]);
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172 %! assert (a(2).foo, 5)
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173 %! assert (a(2).bar, 6)
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174 %! assert (p, [2; 1]);
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175 %!test
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176 %! a(2) = orderfields (b, fieldnames (a));
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177 %! assert (a(2).foo, 5)
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178 %! assert (a(2).bar, 6)
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179 %!test
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180 %! a(1:2) = orderfields (c, fieldnames (a));
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181 %! assert (a(2).foo, 9)
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182 %! assert (a(2).bar, 8)
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183
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184 %!test
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185 %! aa.x = {1, 2};
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186 %! aa.y = 3;
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187 %! aa(2).x = {4, 5};
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188 %! bb.y = {6, 7};
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189 %! bb.x = 8;
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190 %! aa(2) = orderfields (bb, aa);
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191 %! assert (aa(2).x, 8);
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192 %! assert (aa(2).y{1}, 6);