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annotate scripts/plot/fplot.m @ 6699:3f4ccca05612

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[project @ 2007-06-12 20:48:02 by jwe]
author jwe
date Tue, 12 Jun 2007 20:48:03 +0000
parents 0c3537d2a844
children 3058060c560f
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1 ## Copyright (C) 2005 Paul Kienzle <pkienzle@users.sf.net>
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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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} fplot (@var{fn}, @var{limits})
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22 ## @deftypefnx {Function File} {} fplot (@var{fn}, @var{limits}, @var{n})
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23 ## Plot a function @var{fn}, within the defined limits. @var{fn}
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24 ## an be either a string, a function handle or an inline function.
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25 ## The limits of the plot are given by @var{limits} of the form
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26 ## @code{[@var{xlo}, @var{xhi}]} or @code{[@var{xlo}, @var{xhi},
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27 ## @var{ylo}, @var{yhi}]}. @var{n} is the number of points to use and
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28 ## defaults to 100.
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29 ##
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30 ## @example
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31 ## fplot ("cos", [0, 2*pi])
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32 ## fplot ("[cos(x), sin(x)]", [0, 2*pi])
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33 ## @end example
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34 ## @end deftypefn
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35
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36 function fplot (fn, limits, n)
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37 if (nargin < 2 || nargin > 3)
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38 print_usage ();
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39 endif
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40
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41 if (nargin < 3)
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42 n = 100;
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43 endif
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44
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45 x = linspace (limits(1), limits(2), n)';
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46
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47 nam = fn;
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48 if (strcmp (typeinfo (fn), "inline function"))
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49 fn = vectorize (fn);
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50 y = fn (x);
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51 nam = formula (fn);
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52 elseif (isa (fn, "function_handle"))
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53 y = fn (x);
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54 nam = func2str (fn);
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55 elseif (all (isalnum (fn)))
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56 y = feval (fn, x);
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57 else
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58 finl = vectorize (inline (fn));
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59 y = finl (x);
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60 endif
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61
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62 if (length (limits) > 2)
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63 axis (limits);
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64 endif
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65
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66 plot (x, y, [";", nam, ";"]);
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67
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68 endfunction