Mercurial > hg > octave-nkf
annotate scripts/testfun/demo.m @ 8920:eb63fbe60fab
update copyright notices
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sat, 07 Mar 2009 10:41:27 -0500 |
| parents | 5dd06f19e9be |
| children | 1bf0ce0930be |
| rev | line source |
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| 8920 | 1 ## Copyright (C) 2000, 2006, 2007, 2008, 2009 Paul Kienzle |
| 5589 | 2 ## |
| 7016 | 3 ## This file is part of Octave. |
| 5589 | 4 ## |
| 7016 | 5 ## Octave is free software; you can redistribute it and/or modify it |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 5589 | 14 ## |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 5589 | 18 |
| 19 ## -*- texinfo -*- | |
| 20 ## @deftypefn {Function File} {} demo ('@var{name}',@var{n}) | |
| 21 ## | |
| 22 ## Runs any examples associated with the function '@var{name}'. | |
| 23 ## Examples are stored in the script file, or in a file with the same | |
| 24 ## name but no extension somewhere on your path. To keep them separate | |
| 25 ## from the usual script code, all lines are prefixed by @code{%!}. Each | |
| 26 ## example is introduced by the keyword 'demo' flush left to the prefix, | |
| 27 ## with no intervening spaces. The remainder of the example can contain | |
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28 ## arbitrary Octave code. For example: |
| 5589 | 29 ## |
| 30 ## @example | |
| 31 ## %!demo | |
| 32 ## %! t=0:0.01:2*pi; x = sin(t); | |
| 33 ## %! plot(t,x) | |
| 34 ## %! %------------------------------------------------- | |
| 35 ## %! % the figure window shows one cycle of a sine wave | |
| 36 ## @end example | |
| 37 ## | |
| 38 ## Note that the code is displayed before it is executed, so a simple | |
| 39 ## comment at the end suffices. It is generally not necessary to use | |
| 40 ## disp or printf within the demo. | |
| 41 ## | |
| 42 ## Demos are run in a function environment with no access to external | |
| 43 ## variables. This means that all demos in your function must use | |
| 44 ## separate initialization code. Alternatively, you can combine your | |
| 45 ## demos into one huge demo, with the code: | |
| 46 ## | |
| 47 ## @example | |
| 48 ## %! input("Press <enter> to continue: ","s"); | |
| 49 ## @end example | |
| 50 ## | |
| 51 ## between the sections, but this is discouraged. Other techniques | |
| 52 ## include using multiple plots by saying figure between each, or | |
| 53 ## using subplot to put multiple plots in the same window. | |
| 54 ## | |
| 55 ## Also, since demo evaluates inside a function context, you cannot | |
| 56 ## define new functions inside a demo. Instead you will have to | |
| 57 ## use @code{eval(example('function',n))} to see them. Because eval only | |
| 58 ## evaluates one line, or one statement if the statement crosses | |
| 59 ## multiple lines, you must wrap your demo in "if 1 <demo stuff> endif" | |
| 60 ## with the 'if' on the same line as 'demo'. For example, | |
| 61 ## | |
| 62 ## @example | |
| 63 ## %!demo if 1 | |
| 64 ## %! function y=f(x) | |
| 65 ## %! y=x; | |
| 66 ## %! endfunction | |
| 67 ## %! f(3) | |
| 68 ## %! endif | |
| 69 ## @end example | |
| 5642 | 70 ## @seealso{test, example} |
| 5589 | 71 ## @end deftypefn |
| 72 | |
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73 ## FIXME: modify subplot so that gnuplot_has_multiplot == 0 causes it to |
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74 ## use the current figure window but pause if not plotting in the |
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75 ## first subplot. |
| 5589 | 76 |
| 6494 | 77 function demo (name, n) |
| 5589 | 78 |
| 79 if (nargin < 1 || nargin > 2) | |
| 6046 | 80 print_usage (); |
| 5589 | 81 endif |
| 82 | |
| 83 if (nargin < 2) | |
| 84 n = 0; | |
| 85 endif | |
| 86 | |
| 6494 | 87 [code, idx] = test (name, "grabdemo"); |
| 88 if (length (idx) == 0) | |
| 89 warning ("demo not available for %s", name); | |
| 5589 | 90 return; |
| 6494 | 91 elseif (n >= length (idx)) |
| 92 warning ("only %d demos available for %s", length (idx) - 1, name); | |
| 5589 | 93 return; |
| 94 endif | |
| 95 | |
| 96 | |
| 97 if (n > 0) | |
| 98 doidx = n; | |
| 99 else | |
| 6494 | 100 doidx = 1:length(idx)-1; |
| 5589 | 101 endif |
| 6494 | 102 for i = 1:length (doidx) |
| 5589 | 103 ## Pause between demos |
| 104 if (i > 1) | |
| 6494 | 105 input ("Press <enter> to continue: ", "s"); |
| 5589 | 106 endif |
| 107 | |
| 108 ## Process each demo without failing | |
| 109 try | |
| 6494 | 110 block = code(idx(doidx(i)):idx(doidx(i)+1)-1); |
| 5589 | 111 ## Use an environment without variables |
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112 eval (cstrcat ("function __demo__()\n", block, "\nendfunction")); |
| 5589 | 113 ## Display the code that will be executed before executing it |
| 6494 | 114 printf ("%s example %d:%s\n\n", name, doidx(i), block); |
| 5589 | 115 __demo__; |
| 116 catch | |
| 117 ## Let the programmer know which demo failed. | |
| 6494 | 118 printf ("%s example %d: failed\n%s", name, doidx(i), __error_text__); |
| 5589 | 119 end_try_catch |
| 120 clear __demo__; | |
| 121 endfor | |
| 122 | |
| 123 endfunction | |
| 124 | |
| 125 %!demo | |
| 126 %! t=0:0.01:2*pi; x = sin(t); | |
| 127 %! plot(t,x) | |
| 128 %! %------------------------------------------------- | |
| 129 %! % the figure window shows one cycle of a sine wave |