Mercurial > octave-nkf

annotate scripts/plot/fplot.m @ 6046:34f96dd5441b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[project @ 2006-10-10 16:10:25 by jwe]
author jwe
date Tue, 10 Oct 2006 16:10:31 +0000
parents 27c966e4b2dc
children 0c3537d2a844
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5820
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
1 ## Copyright (C) 2005 Paul Kienzle <pkienzle@users.sf.net>
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
2 ##
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
3 ## This file is part of Octave.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
4 ##
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
5 ## Octave is free software; you can redistribute it and/or modify it
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
6 ## under the terms of the GNU General Public License as published by
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
7 ## the Free Software Foundation; either version 2, or (at your option)
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
8 ## any later version.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
9 ##
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
10 ## Octave is distributed in the hope that it will be useful, but
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
13 ## General Public License for more details.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
14 ##
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
15 ## You should have received a copy of the GNU General Public License
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
16 ## along with Octave; see the file COPYING. If not, write to the Free
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
18 ## 02110-1301, USA.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
19
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
20 ## -*- texinfo -*-
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
21 ## @deftypefn {Function File} {} fplot (@var{fn}, @var{limits})
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
22 ## @deftypefnx {Function File} {} fplot (@var{fn}, @var{limits}, @var{n})
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
23 ## Plots a function @var{fn}, within the defined limits. @var{fn}
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
24 ## an be either a string, a function handle or an inline function.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
25 ## The limits of the plot are given by @var{limits} of the form
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
26 ## @code{[@var{xlo}, @var{xhi}]} or @code{[@var{xlo}, @var{xhi},
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
27 ## @var{ylo}, @var{yhi}]}. @var{n} is the number of points to use and
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
28 ## defaults to 100.
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
29 ##
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
30 ## @example
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
31 ## fplot('cos',[0,2*pi])
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
32 ## fplot('[cos(x),sin(x)]',[0,2*pi])
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
33 ## @end example
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
34 ## @end deftypefn
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
35
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
36 function fplot (fn, limits, n)
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
37 if (nargin < 2 || nargin > 3)
6046
34f96dd5441b [project @ 2006-10-10 16:10:25 by jwe]
jwe
parents: 5820
diff changeset
38 print_usage ();
5820
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
39 endif
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
40
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
41 if (nargin < 3)
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
42 n = 100;
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
43 endif
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
44
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
45 x = linspace (limits(1), limits(2), n)';
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
46
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
47 if (strcmp (class (fn), "inline function")
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
48 || strcmp (class (fn), "function handle"))
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
49 y = fn (x);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
50 elseif (all (isalnum (fn)))
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
51 y = feval (fn, x);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
52 else
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
53 finl = inline (fn);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
54 y = finl (x);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
55 endif
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
56
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
57 if (length (limits) > 2)
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
58 axis (limits);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
59 endif
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
60
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
61 plot (x, y, [";", fn, ";"]);
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
62
27c966e4b2dc [project @ 2006-05-17 21:00:54 by jwe]
jwe
parents:
diff changeset
63 endfunction