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1 ## Copyright (C) 2007 David Bateman |
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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} {} structfun (@var{func}, @var{s}) |
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21 ## @deftypefnx {Function File} {[@var{a}, @var{b}] =} structfun (@dots{}) |
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22 ## @deftypefnx {Function File} {} structfun (@dots{}, 'ErrorHandler', @var{errfunc}) |
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23 ## @deftypefnx {Function File} {} structfun (@dots{}, 'UniformOutput', @var{val}) |
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24 ## |
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25 ## Evaluate the function named @var{name} on the fields of the structure |
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26 ## @var{s}. The fields of @var{s} are passed to the function @var{func} |
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27 ## individually. |
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28 ## |
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29 ## @code{structfun} accepts an arbitrary function @var{func} in the form of |
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30 ## an inline function, function handle, or the name of a function (in a |
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31 ## character string). In the case of a character string argument, the |
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32 ## function must accept a single argument named @var{x}, and it must return |
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33 ## a string value. If the function returns more than one argument, they are |
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34 ## returned as separate output variables. |
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35 ## |
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36 ## If the param 'UniformOutput' is set to true (the default), then the function |
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37 ## must return either a single element which will be concatenated into the |
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38 ## return value. If 'UniformOutput is false, the outputs placed in a structure |
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39 ## with the same fieldnames as the input structure. |
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40 ## |
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41 ## @example |
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42 ## @group |
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43 ## s.name1 = "John Smith"; |
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44 ## s.name2 = "Jill Jones"; |
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45 ## structfun (@@(x) regexp (x, '(\w+)$', 'matches')@{1@}, s, |
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46 ## 'UniformOutput', false) |
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47 ## @end group |
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48 ## @end example |
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49 ## |
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50 ## Given the parameter 'ErrorHandler', then @var{errfunc} defines a function to |
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51 ## call in case @var{func} generates an error. The form of the function is |
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52 ## |
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53 ## @example |
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54 ## function [@dots{}] = errfunc (@var{se}, @dots{}) |
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55 ## @end example |
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56 ## |
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57 ## where there is an additional input argument to @var{errfunc} relative to |
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58 ## @var{func}, given by @var{se}. This is a structure with the elements |
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59 ## 'identifier', 'message' and 'index', giving respectively the error |
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60 ## identifier, the error message, and the index into the input arguments |
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61 ## of the element that caused the error. |
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62 ## @seealso{cellfun, arrayfun} |
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63 ## @end deftypefn |
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64 |
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65 function varargout = structfun (fun, s, varargin); |
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66 if (nargin < 2) |
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67 print_usage (); |
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68 endif |
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69 |
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70 varargout = cell (max ([nargout, 1]), 1); |
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71 [varargout{:}] = cellfun (fun, struct2cell (s), varargin {:}); |
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72 |
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73 if (iscell (varargout{1})) |
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74 [varargout{:}] = cell2struct (varargout{1}, fieldnames(s), 1); |
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75 endif |
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76 endfunction |
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77 |
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78 |
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79 %!test |
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80 %! s.name1 = "John Smith"; |
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81 %! s.name2 = "Jill Jones"; |
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82 %! l.name1 = "Smith"; |
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83 %! l.name2 = "Jones"; |
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84 %! o = structfun (@(x) regexp (x, '(\w+)$', 'matches'){1}, s, |
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85 %! 'UniformOutput', false); |
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86 %! assert (o, l); |
