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annotate scripts/general/structfun.m @ 11471:994e2a93a8e2

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Use uppercase 'A' to refer to matrix inputs in m-files.
author Rik <octave@nomad.inbox5.com>
date Sun, 09 Jan 2011 16:01:05 -0800
parents c776f063fefe
children fd0a3ac60b0e
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1 ## Copyright (C) 2007, 2008, 2009 David Bateman
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2 ## Copyright (C) 2010 VZLU Prague
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} structfun (@var{func}, @var{S})
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22 ## @deftypefnx {Function File} {[@var{A}, @dots{}] =} structfun (@dots{})
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23 ## @deftypefnx {Function File} {} structfun (@dots{}, "ErrorHandler", @var{errfunc})
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24 ## @deftypefnx {Function File} {} structfun (@dots{}, "UniformOutput", @var{val})
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25 ##
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26 ## Evaluate the function named @var{name} on the fields of the structure
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27 ## @var{S}. The fields of @var{S} are passed to the function @var{func}
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28 ## individually.
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29 ##
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30 ## @code{structfun} accepts an arbitrary function @var{func} in the form of
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31 ## an inline function, function handle, or the name of a function (in a
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32 ## character string). In the case of a character string argument, the
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33 ## function must accept a single argument named @var{x}, and it must return
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34 ## a string value. If the function returns more than one argument, they are
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35 ## returned as separate output variables.
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36 ##
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37 ## If the parameter "UniformOutput" is set to true (the default), then the
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38 ## function
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39 ## must return a single element which will be concatenated into the
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40 ## return value. If "UniformOutput" is false, the outputs are placed into a
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41 ## structure
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42 ## with the same fieldnames as the input structure.
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43 ##
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44 ## @example
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45 ## @group
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46 ## s.name1 = "John Smith";
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47 ## s.name2 = "Jill Jones";
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48 ## structfun (@@(x) regexp (x, '(\w+)$', "matches")@{1@}, s,
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49 ## "UniformOutput", false)
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50 ## @result{}
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51 ## @{
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52 ## name1 = Smith
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53 ## name2 = Jones
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54 ## @}
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55 ## @end group
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56 ## @end example
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57 ##
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58 ## Given the parameter "ErrorHandler", @var{errfunc} defines a function to
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59 ## call in case @var{func} generates an error. The form of the function is
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60 ##
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61 ## @example
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62 ## function [@dots{}] = errfunc (@var{se}, @dots{})
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63 ## @end example
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64 ##
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65 ## @noindent
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66 ## where there is an additional input argument to @var{errfunc} relative to
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67 ## @var{func}, given by @var{se}. This is a structure with the elements
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68 ## "identifier", "message" and "index", giving respectively the error
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69 ## identifier, the error message, and the index into the input arguments
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70 ## of the element that caused the error. For an example on how to use
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71 ## an error handler, @pxref{doc-cellfun, @code{cellfun}}.
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72 ##
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73 ## @seealso{cellfun, arrayfun, spfun}
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74 ## @end deftypefn
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75
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76 function varargout = structfun (func, S, varargin);
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77
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78 if (nargin < 2)
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79 print_usage ();
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80 endif
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81
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82 nargs = length (varargin);
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83
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84 recognized_opts = {"UniformOutput", "ErrorHandler"};
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85 uo_str = recognized_opts{1};
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86
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87 uniform_output = true;
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88
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89 while (nargs >= 2)
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90 opt_match = strcmpi (varargin{nargs-1}, recognized_opts);
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91 if (opt_match(1))
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92 uniform_output = varargin{nargs};
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93 endif
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94 if (any (opt_match))
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95 nargs -= 2;
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96 else
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97 break;
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98 endif
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99 endwhile
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100
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101 if (nargs > 0)
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102 error ("structfun: invalid options");
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103 endif
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104
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105 varargout = cell (max ([nargout, 1]), 1);
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106 [varargout{:}] = cellfun (func, struct2cell (S), varargin{:});
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107
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108 if (! uniform_output)
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109 varargout = cellfun (@cell2struct, varargout, {fieldnames(S)}, {1}, uo_str, false);
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110 endif
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111 endfunction
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112
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113
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114 %!test
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115 %! s.name1 = "John Smith";
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116 %! s.name2 = "Jill Jones";
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117 %! l.name1 = "Smith";
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118 %! l.name2 = "Jones";
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119 %! o = structfun (@(x) regexp (x, '(\w+)$', "matches"){1}, s,
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120 %! "UniformOutput", false);
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121 %! assert (o, l);
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122
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123 %!function [a, b] = twoouts (x)
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124 %! a = x + x;
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125 %! b = x * x;
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126
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127 %!test
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128 %! s = struct ("a", {1, 2, 3}, "b", {4, 5, 6});
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129 %! c(1:2, 1, 1) = [2; 8];
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130 %! c(1:2, 1, 2) = [4; 10];
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131 %! c(1:2, 1, 3) = [6; 12];
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132 %! d(1:2, 1, 1) = [1; 16];
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133 %! d(1:2, 1, 2) = [4; 25];
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134 %! d(1:2, 1, 3) = [9; 36];
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135 %! [aa, bb] = structfun(@twoouts, s);
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136 %! assert(aa, c);
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137 %! assert(bb, d);
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138
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139 %!test
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140 %! s = struct ("a", {1, 2, 3}, "b", {4, 5, 6});
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141 %! c = struct ("a", {2, 4, 6}, "b", {8, 10, 12});
aa0f575cf39b improve structfun's Matlab compatibility
Jaroslav Hajek <highegg@gmail.com>
parents: 10122
diff changeset
142 %! d = struct ("a", {1, 4, 9}, "b", {16, 25, 36});
11190
b1f4bdc276b6 Use CamelCase for 'UniformOutput' option to cellfun.
Rik <octave@nomad.inbox5.com>
parents: 10846
diff changeset
143 %! [aa, bb] = structfun(@twoouts, s, "UniformOutput", false);
10132
aa0f575cf39b improve structfun's Matlab compatibility
Jaroslav Hajek <highegg@gmail.com>
parents: 10122
diff changeset
144 %! assert(aa, c);
aa0f575cf39b improve structfun's Matlab compatibility
Jaroslav Hajek <highegg@gmail.com>
parents: 10122
diff changeset
145 %! assert(bb, d);