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1 ## Copyright (C) 2000 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 {Function File} {} example ('@var{name}',@var{n}) |
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21 ## @deftypefnx {Function File} {[@var{x}, @var{idx}] =} example ('@var{name}',@var{n}) |
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22 ## |
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23 ## Display the code for example @var{n} associated with the function |
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24 ## '@var{name}', but do not run it. If @var{n} is not given, all examples |
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25 ## are displayed. |
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26 ## |
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27 ## Called with output arguments, the examples are returned in the form of |
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28 ## a string @var{x}, with @var{idx} indicating the ending position of the |
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29 ## various examples. |
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30 ## |
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31 ## See @code{demo} for a complete explanation. |
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32 ## @seealso{demo, test} |
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33 ## @end deftypefn |
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34 |
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35 ## PKG_ADD: mark_as_command example |
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36 |
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37 function [code_r, idx_r] = example (name, n) |
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38 |
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39 if (nargin < 1 || nargin > 2) |
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40 print_usage (); |
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41 endif |
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42 if (nargin < 2) |
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43 n = 0; |
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44 endif |
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45 |
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46 [code, idx] = test (name, "grabdemo"); |
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47 if (nargout > 0) |
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48 if (n > 0) |
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49 if (n <= length (idx)) |
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50 code_r = code(idx(n):idx(n+1)-1); |
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51 idx_r = [1, length(code_r)+1]; |
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52 else |
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53 code_r = ""; |
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54 idx_r = []; |
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55 endif |
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56 else |
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57 code_r = code; |
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58 idx_r = idx; |
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59 endif |
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60 else |
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61 if (n > 0) |
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62 doidx = n; |
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63 else |
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64 doidx = 1:length(idx)-1; |
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65 endif |
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66 if (length (idx) == 0) |
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67 warning ("example not available for %s", name); |
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68 elseif (n >= length(idx)) |
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69 warning ("only %d examples available for %s", length(idx)-1, name); |
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70 doidx = []; |
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71 endif |
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72 |
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73 for i=1:length(doidx) |
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74 block = code(idx(doidx(i)):idx(doidx(i)+1)-1); |
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75 printf ("%s example %d:%s\n\n", name, doidx(i), block); |
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76 endfor |
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77 endif |
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78 |
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79 endfunction |
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80 |
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81 %!## warning: don't modify the demos without modifying the tests! |
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82 %!demo |
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83 %! example('example'); |
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84 %!demo |
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85 %! t=0:0.01:2*pi; x=sin(t); |
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86 %! plot(t,x) |
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87 |
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88 %!assert (example('example',1), "\n example('example');"); |
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89 %!test |
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90 %! [code, idx] = example('example'); |
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91 %! assert (code, ... |
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92 %! "\n example('example');\n t=0:0.01:2*pi; x=sin(t);\n plot(t,x)") |
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93 %! assert (idx, [1, 22, 59]); |
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94 |
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95 %!error example; |
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96 %!error example('example',3,5) |
