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1 ## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, |
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2 ## 2003, 2004, 2005, 2006, 2007 Shai Ayal |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} contour (@var{z}) |
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22 ## @deftypefnx {Function File} {} contour (@var{z}, @var{vn}) |
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23 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z}) |
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24 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z}, @var{vn}) |
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25 ## @deftypefnx {Function File} {} contour (@dots{}, @var{style}) |
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26 ## @deftypefnx {Function File} {} contour (@var{h}, @dots{}) |
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27 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour (@dots{}) |
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28 ## Plot level curves (contour lines) of the matrix @var{z}, using the |
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29 ## contour matrix @var{c} computed by @code{contourc} from the same |
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30 ## arguments; see the latter for their interpretation. The set of |
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31 ## contour levels, @var{c}, is only returned if requested. For example: |
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32 ## |
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33 ## @example |
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34 ## @group |
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35 ## x = 0:2; |
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36 ## y = x; |
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37 ## z = x' * y; |
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38 ## contour (x, y, z, 2:3) |
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39 ## @end group |
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40 ## @end example |
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41 ## |
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42 ## The style to use for the plot can be defined with a line style @var{style} |
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43 ## in a similar manner to the line styles used with the @code{plot} command. |
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44 ## Any markers defined by @var{style} are ignored. |
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45 ## |
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46 ## The optional input and output argument @var{h} allows an axis handle to |
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47 ## be passed to @code{contour} and the handles to the contour objects to be |
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48 ## returned. |
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49 ## @seealso{contourc, patch, plot} |
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50 ## @end deftypefn |
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51 |
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52 ## Author: Shai Ayal <shaiay@users.sourceforge.net> |
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53 |
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54 function [c, h] = contour (varargin) |
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55 |
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56 [xh, varargin] = __plt_get_axis_arg__ ("contour", varargin{:}); |
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57 |
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58 oldh = gca (); |
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59 unwind_protect |
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60 axes (xh); |
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61 newplot (); |
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62 [ctmp, htmp] = __contour__ (xh, NaN, varargin{:}); |
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63 unwind_protect_cleanup |
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64 axes (oldh); |
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65 end_unwind_protect |
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66 |
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67 if (nargout > 0) |
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68 c = ctmp; |
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69 h = htmp; |
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70 endif |
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71 |
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72 endfunction |
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73 |
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74 %!demo |
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75 %! [x, y, z] = peaks (); |
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76 %! contour (x, y, z); |
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77 |
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78 %!demo |
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79 %! [theta, r] = meshgrid (linspace (0, 2*pi, 64), linspace(0,1,64)); |
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80 %! [X, Y] = pol2cart (theta, r); |
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81 %! Z = sin(2*theta).*(1-r); |
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82 %! contour(X, Y, abs(Z), 10) |
