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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 b0084095098e
children b00181c65533
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fd0a3ac60b0e update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2011 John W. Eaton
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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} {} surfc (@var{x}, @var{y}, @var{z})
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21 ## Plot a surface and contour given matrices @var{x}, and @var{y} from
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22 ## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
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23 ## @var{y} coordinates of the mesh. If @var{x} and @var{y} are vectors,
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24 ## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus,
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25 ## columns of @var{z} correspond to different @var{x} values and rows of
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26 ## @var{z} correspond to different @var{y} values.
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27 ## @seealso{meshgrid, surf, contour}
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28 ## @end deftypefn
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29
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30 function h = surfc (varargin)
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31
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32 newplot ();
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33
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34 tmp = surface (varargin{:});
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35
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36 ax = get (tmp, "parent");
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37
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38 set (tmp, "facecolor", "flat");
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39
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40 if (! ishold ())
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41 set (ax, "view", [-37.5, 30],
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42 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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43 endif
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44
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45 drawnow ();
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46 zmin = get (ax, "zlim")(1);
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47
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48 [c, tmp2] = __contour__ (ax, zmin, varargin{:});
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49
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50 tmp = [tmp; tmp2];
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51
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52 if (nargout > 0)
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53 h = tmp;
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54 endif
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55
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56 endfunction
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57
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58 %!demo
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59 %! clf
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60 %! [~,~,Z]=peaks;
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61 %! surfc(Z);
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62
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63 %!demo
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64 %! [~,~,Z]=sombrero;
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65 %! [Fx,Fy] = gradient(Z);
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66 %! surfc(Z,Fx+Fy);
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67 %! shading interp;
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68
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69 %!demo
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70 %! [X,Y,Z]=sombrero;
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71 %! [~,Fy] = gradient(Z);
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72 %! surfc(X,Y,Z,Fy);
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73 %! shading interp;