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annotate scripts/miscellaneous/setfield.m @ 19790:446c46af4b42 stable

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strip trailing whitespace from most source files * Makefile.am, NEWS, build-aux/common.mk, configure.ac, doc/Makefile.am, doc/doxyhtml/Makefile.am, doc/interpreter/Makefile.am, doc/interpreter/arith.txi, doc/interpreter/audio.txi, doc/interpreter/basics.txi, doc/interpreter/bugs.txi, doc/interpreter/container.txi, doc/interpreter/cp-idx.txi, doc/interpreter/data.txi, doc/interpreter/debug.txi, doc/interpreter/diagperm.txi, doc/interpreter/diffeq.txi, doc/interpreter/doccheck/README, doc/interpreter/doccheck/spellcheck, doc/interpreter/emacs.txi, doc/interpreter/errors.txi, doc/interpreter/eval.txi, doc/interpreter/expr.txi, doc/interpreter/external.txi, doc/interpreter/fn-idx.txi, doc/interpreter/func.txi, doc/interpreter/geometry.txi, doc/interpreter/geometryimages.m, doc/interpreter/gpl.txi, doc/interpreter/grammar.txi, doc/interpreter/gui.txi, doc/interpreter/image.txi, doc/interpreter/install.txi, doc/interpreter/interp.txi, doc/interpreter/interpimages.m, 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scripts/statistics/distributions/frnd.m, scripts/statistics/distributions/gamrnd.m, scripts/statistics/distributions/geornd.m, scripts/statistics/distributions/hygernd.m, scripts/statistics/distributions/kolmogorov_smirnov_cdf.m, scripts/statistics/distributions/laplace_cdf.m, scripts/statistics/distributions/laplace_pdf.m, scripts/statistics/distributions/logistic_cdf.m, scripts/statistics/distributions/logistic_pdf.m, scripts/statistics/distributions/lognrnd.m, scripts/statistics/distributions/nbincdf.m, scripts/statistics/distributions/nbininv.m, scripts/statistics/distributions/nbinpdf.m, scripts/statistics/distributions/nbinrnd.m, scripts/statistics/distributions/normrnd.m, scripts/statistics/distributions/poissinv.m, scripts/statistics/distributions/poissrnd.m, scripts/statistics/distributions/tinv.m, scripts/statistics/distributions/trnd.m, scripts/statistics/distributions/unidcdf.m, scripts/statistics/distributions/unidpdf.m, scripts/statistics/distributions/unidrnd.m, scripts/statistics/distributions/unifrnd.m, scripts/statistics/distributions/wblrnd.m, scripts/statistics/models/module.mk, scripts/statistics/tests/kruskal_wallis_test.m, scripts/strings/base2dec.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strjoin.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/speed.m, scripts/testfun/test.m, scripts/time/asctime.m, scripts/time/datenum.m, scripts/time/datevec.m, scripts/time/weekday.m, src/Makefile.am, test/Makefile.am, test/build-bc-overload-tests.sh, test/build-sparse-tests.sh, test/jit.tst, test/line-continue.tst: Strip trailing whitespace.
author John W. Eaton <jwe@octave.org>
date Tue, 20 Jan 2015 08:26:57 -0500
parents ea0d4dea1a17
children 0e1f5a750d00
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1 ## Copyright (C) 2000-2013 Etienne Grossmann
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2 ## Copyright (C) 2009 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} {@var{s} =} setfield (@var{s}, @var{field}, @var{val})
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22 ## @deftypefnx {Function File} {@var{s} =} setfield (@var{s}, @var{idx1}, @var{field1}, @var{idx2}, @var{field2}, @dots{}, @var{val})
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23 ##
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24 ## Set a field member @var{field} in a structure @var{s} equal to @var{val}.
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25 ## For example:
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26 ##
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27 ## @example
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28 ## @group
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29 ## @var{s} = struct ();
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30 ## @var{s} = setfield (@var{s}, "foo bar", 42);
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31 ## @end group
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32 ## @end example
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33 ##
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34 ## @noindent
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35 ## This is equivalent to
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36 ##
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37 ## @example
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38 ## @var{s}.("foo bar") = 42;
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39 ## @end example
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40 ##
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41 ## @noindent
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42 ## Note that ordinary structure syntax @code{@var{s}.foo bar = 42} cannot be
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43 ## used here, as the field name is not a valid Octave identifier. Using
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44 ## arbitrary strings for field name is incompatible with @sc{matlab}, so
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45 ## this usage will warn if the @code{Octave:matlab-incompatible} warning
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46 ## is set. @xref{XREFwarning_ids}.
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47 ##
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48 ## With the second calling form, set a field on a structure array,
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49 ## possibly nested, with successive nested indices @var{idx1},
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50 ## @var{idx2}, @dots{} and fields @var{field1}, @var{field2}, @dots{}
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51 ## The indices must be cells containing the desired index at this
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52 ## nesting depth.
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53 ##
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54 ## Thus consider instead,
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55 ##
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56 ## @example
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57 ## @group
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58 ## @var{s} = struct ("baz", 42);
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59 ## setfield (@var{s}, @{1@}, "foo", @{1@}, "bar", 5)
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60 ## @result{} ans =
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61 ## scalar structure containing the fields:
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62 ## baz = 42
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63 ## foo =
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64 ## scalar structure containing the fields:
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65 ## bar = 54
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66 ## @end group
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67 ## @end example
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68 ##
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69 ## Here we first have an ordinary structure array with one field
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70 ## @code{baz} set to 42. Then we set another field in a nested scalar structure
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71 ## indexing with two single cells containing the unique desired indices.
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72 ##
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73 ## Finally an example with nested structure arrays,
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74 ##
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75 ## @example
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76 ## @group
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77 ## @var{sa}.foo = 1;
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78 ## @var{sa} = setfield (@var{sa}, @{2@}, "bar", @{3@}, "baz", 6);
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79 ## @var{sa}(2).bar(3)
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80 ## @result{} ans =
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81 ## scalar structure containing the fields:
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82 ## baz = 6
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83 ## @end group
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84 ## @end example
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85 ##
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86 ## Here @var{sa} is a structure array whose field @code{fd} at elements
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87 ## 1 and 2 field is in turn
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88 ## another structure array whose third element is a structure
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89 ##
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90 ## Note that the same result as in the above example could be achieved by:
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91 ##
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92 ## @example
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93 ## @group
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94 ## @var{SA}.foo = 1;
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95 ## @var{SA}(2).bar(3).baz = 6
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96 ## @end group
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97 ## @end example
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98 ## @seealso{getfield, rmfield, isfield, fieldnames, isstruct, struct}
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99 ## @end deftypefn
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100
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101 ## Author: Etienne Grossmann <etienne@cs.uky.edu>
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102
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103 function obj = setfield (obj, varargin)
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104 if (nargin < 3)
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105 print_usage ();
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106 endif
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107 subs = varargin(1:end-1);
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108 rhs = varargin{end};
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109 flds = cellfun ("isclass", subs, "char");
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110 idxs = cellfun ("isclass", subs, "cell");
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111 if (all (flds | idxs))
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112 typs = merge (flds, {"."}, {"()"});
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113 obj = subsasgn (obj, struct ("type", typs, "subs", subs), rhs);
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114 else
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115 error ("setfield: invalid index");
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116 endif
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117 endfunction
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118
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119
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120 %!test
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121 %! x.a = "hello";
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122 %! x = setfield (x, "b", "world");
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123 %! y = struct ("a", "hello", "b", "world");
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124 %! assert (x,y);
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125 %!test
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126 %! oo(1,1).f0 = 1;
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127 %! oo = setfield (oo,{1,2},"fd",{3},"b", 6);
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128 %! assert (oo(1,2).fd(3).b, 6);
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129