Mercurial > octave
annotate scripts/miscellaneous/nthargout.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
rev | line source |
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1 ## Copyright (C) 2012-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
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6 ## |
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7 ## This file is part of Octave. |
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8 ## |
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9 ## Octave is free software: you can redistribute it and/or modify it |
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10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
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13 ## |
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14 ## Octave is distributed in the hope that it will be useful, but |
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15 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
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18 ## |
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19 ## You should have received a copy of the GNU General Public License |
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20 ## along with Octave; see the file COPYING. If not, see |
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21 ## <https://www.gnu.org/licenses/>. |
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22 |
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23 ## -*- texinfo -*- |
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24 ## @deftypefn {} {} nthargout (@var{n}, @var{func}, @dots{}) |
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25 ## @deftypefnx {} {} nthargout (@var{n}, @var{ntot}, @var{func}, @dots{}) |
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26 ## Return the @var{n}th output argument of the function specified by the |
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27 ## function handle or string @var{func}. |
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28 ## |
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29 ## Any additional arguments are passed directly to @var{func}. The total |
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30 ## number of arguments to call @var{func} with can be passed in @var{ntot}; by |
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31 ## default @var{ntot} is @var{n}. The input @var{n} can also be a vector of |
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32 ## indices of the output, in which case the output will be a cell array of the |
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33 ## requested output arguments. |
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34 ## |
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35 ## The intended use @code{nthargout} is to avoid intermediate variables. For |
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36 ## example, when finding the indices of the maximum entry of a matrix, the |
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37 ## following two compositions of nthargout |
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38 ## |
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39 ## @example |
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40 ## @group |
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41 ## @var{m} = magic (5); |
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42 ## cell2mat (nthargout ([1, 2], @@ind2sub, size (@var{m}), |
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43 ## nthargout (2, @@max, @var{m}(:)))) |
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44 ## @result{} 5 3 |
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45 ## @end group |
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46 ## @end example |
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47 ## |
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48 ## @noindent |
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49 ## are completely equivalent to the following lines: |
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50 ## |
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51 ## @example |
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52 ## @group |
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53 ## @var{m} = magic (5); |
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54 ## [~, idx] = max (@var{M}(:)); |
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55 ## [i, j] = ind2sub (size (@var{m}), idx); |
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56 ## [i, j] |
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57 ## @result{} 5 3 |
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58 ## @end group |
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59 ## @end example |
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60 ## |
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61 ## It can also be helpful to have all output arguments in a single cell in the |
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62 ## following manner: |
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63 ## |
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64 ## @example |
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65 ## @var{USV} = nthargout ([1:3], @@svd, hilb (5)); |
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66 ## @end example |
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67 ## |
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68 ## @seealso{nargin, nargout, varargin, varargout, isargout} |
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69 ## @end deftypefn |
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70 |
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71 ## Author: Jordi GutiƩrrez Hermoso |
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72 |
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73 function out = nthargout (n, varargin) |
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74 |
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75 if (nargin < 2) |
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76 print_usage (); |
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77 endif |
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78 |
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79 if (is_function_handle (varargin{1}) || ischar (varargin{1})) |
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80 ntot = max (n(:)); |
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81 func = varargin{1}; |
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82 args = varargin(2:end); |
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83 elseif (isnumeric (varargin{1}) |
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84 && (is_function_handle (varargin{2}) || ischar (varargin{2}))) |
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85 ntot = varargin{1}; |
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86 func = varargin{2}; |
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87 args = varargin(3:end); |
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88 else |
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89 print_usage (); |
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90 endif |
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91 |
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92 if (any (n != fix (n)) || ntot != fix (ntot) || any (n <= 0) || ntot <= 0) |
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93 error ("nthargout: N and NTOT must consist of positive integers"); |
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94 endif |
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95 |
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96 outargs = cell (1, ntot); |
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97 |
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98 try |
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99 [outargs{:}] = feval (func, args{:}); |
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100 if (numel (n) > 1) |
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101 out = outargs(n); |
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102 else |
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103 out = outargs{n}; |
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104 endif |
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105 catch |
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106 err = lasterr (); |
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107 if (strfind ("some elements undefined in return list", err)) |
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108 error ("nthargout: Too many output arguments: %d", ntot); |
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109 else |
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110 error (err); |
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111 endif |
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112 end_try_catch |
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113 |
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114 endfunction |
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115 |
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116 |
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117 %!shared m |
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118 %! m = magic (5); |
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119 %!assert (nthargout ([1,2], @ind2sub, size (m), nthargout (2, @max, m(:))), {5,3}) |
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62d1f56b0be7
New nthargout function
Jordi Gutiérrez Hermoso <jordigh@octave.org>
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120 %!assert (nthargout (3, @find, m(m>20)), [23, 24, 25, 21, 22]') |