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codesprint: add demo for surf.m and surfc.m
author Kai Habel <kai.habel@gmx.de>
date Sat, 16 Jul 2011 20:56:20 +0200
parents d6619410e79c
children 5f0bb45e615c
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2007-2011 Kai Habel
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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} {} surf (@var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} surf (@var{z})
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22 ## @deftypefnx {Function File} {} surf (@dots{}, @var{c})
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23 ## @deftypefnx {Function File} {} surf (@var{hax}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} surf (@dots{})
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25 ## Plot a surface given matrices @var{x}, and @var{y} from @code{meshgrid} and
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26 ## a matrix @var{z} corresponding to the @var{x} and @var{y} coordinates of
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27 ## the mesh. If @var{x} and @var{y} are vectors, then a typical vertex
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28 ## is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns of @var{z}
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29 ## correspond to different @var{x} values and rows of @var{z} correspond
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30 ## to different @var{y} values.
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31 ##
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32 ## The color of the surface is derived from the @code{colormap} and
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33 ## the value of @var{z}. Optionally the color of the surface can be
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34 ## specified independent of @var{z}, by adding a fourth matrix, @var{c}.
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35 ## @seealso{colormap, contour, meshgrid, mesh}
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36 ## @end deftypefn
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37
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38 ## Author: Kai Habel <kai.habel@gmx.de>
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39
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40 function retval = surf (varargin)
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41
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42 [h, varargin] = __plt_get_axis_arg__ ("surf", varargin{:});
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43
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44 oldh = gca ();
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45 unwind_protect
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46 axes (h);
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47 newplot ();
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48 tmp = surface (varargin{:});
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49
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50 if (! ishold ())
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51 set (h, "view", [-37.5, 30],
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52 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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53 endif
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54 unwind_protect_cleanup
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55 axes (oldh);
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56 end_unwind_protect
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57
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58 if (nargout > 0)
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59 retval = tmp;
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60 endif
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61
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62 endfunction
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63
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64 %!demo
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65 %! clf
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66 %! [~,~,Z]=peaks;
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67 %! surf(Z);
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68
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69 %!demo
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70 %! [~,~,Z]=sombrero;
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71 %! [Fx,Fy] = gradient(Z);
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72 %! surf(Z,Fx+Fy);
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73 %! shading interp;
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74
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75 %!demo
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76 %! [X,Y,Z]=sombrero;
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77 %! [~,Fy] = gradient(Z);
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78 %! surf(X,Y,Z,Fy);
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79 %! shading interp;