annotate scripts/testfun/example.m @ 19014:90a541a12c4b

example.m: Use ex_code, ex_idx for output variable names. * example.m: Use ex_code, ex_idx for output variable names.
author Rik <rik@octave.org>
date Sat, 16 Aug 2014 20:08:14 -0700
parents d63878346099
children 26a770330953
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1 ## Copyright (C) 2000-2013 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 {Command} {} example @var{name}
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21 ## @deftypefnx {Command} {} example @var{name} @var{n}
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22 ## @deftypefnx {Function File} {} example ("@var{name}")
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23 ## @deftypefnx {Function File} {} example ("@var{name}", @var{n})
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24 ## @deftypefnx {Function File} {[@var{s}, @var{idx}] =} example (@dots{})
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25 ##
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26 ## Display the code for example @var{n} associated with the function
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27 ## @var{name}, but do not run it. If @var{n} is not specified, all examples
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28 ## are displayed.
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29 ##
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30 ## When called with output arguments, the examples are returned in the form of
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31 ## a string @var{s}, with @var{idx} indicating the ending position of the
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32 ## various examples.
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33 ##
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34 ## See @code{demo} for a complete explanation.
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35 ## @seealso{demo, test}
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36 ## @end deftypefn
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37
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38 function [ex_code, ex_idx] = example (name, n = 0)
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39
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40 if (nargin < 1 || nargin > 2)
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41 print_usage ();
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42 endif
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43
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44 if (ischar (n))
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45 n = str2double (n);
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46 endif
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47
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48 [code, idx] = test (name, "grabdemo");
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49 if (nargout > 0)
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50 if (n > 0)
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51 if (n <= length (idx))
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52 ex_code = code(idx(n):idx(n+1)-1);
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53 ex_idx = [1, length(ex_code)+1];
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54 else
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55 ex_code = "";
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56 ex_idx = [];
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57 endif
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58 else
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59 ex_code = code;
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60 ex_idx = idx;
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61 endif
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62 else
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63 if (n > 0)
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64 doidx = n;
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65 else
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66 doidx = 1:length (idx) - 1;
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67 endif
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68 if (isempty (idx))
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69 warning ("no example available for %s", name);
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70 return;
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71 elseif (n >= length (idx))
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72 warning ("only %d examples available for %s", length (idx) - 1, name);
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73 return;
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74 endif
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75
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76 for i = 1:length (doidx)
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77 block = code(idx(doidx(i)):idx(doidx(i)+1)-1);
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78 printf ("%s example %d:%s\n\n", name, doidx(i), block);
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79 endfor
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80 endif
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81
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82 endfunction
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83
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84
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85 ## WARNING: don't modify the demos without modifying the tests!
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86 %!demo
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87 %! example ("example");
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88
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89 %!demo
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90 %! clf;
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91 %! t = 0:0.01:2*pi; x = sin (t);
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92 %! plot (t,x)
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93
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94 %!assert (example ("example", 1), "\n example (\"example\");");
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95 %!test
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96 %! [code, idx] = example ("example");
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97 %! assert (code, ...
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98 %! "\n example (\"example\");\n clf;\n t = 0:0.01:2*pi; x = sin (t);\n plot (t,x)");
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99 %! assert (idx, [1, 23, 73]);
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100
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101 %% Test input validation
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102 %!error example
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103 %!error example ("example", 3, 5)
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104