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1 ## Copyright (C) 1996, 1997 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} {} mesh (@var{x}, @var{y}, @var{z}) |
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21 ## Plot a mesh given matrices @var{x}, and @var{y} from @code{meshgrid} and |
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22 ## a matrix @var{z} corresponding to the @var{x} and @var{y} coordinates of |
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23 ## the mesh. If @var{x} and @var{y} are vectors, then a typical vertex |
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24 ## is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns of @var{z} |
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25 ## correspond to different @var{x} values and rows of @var{z} correspond |
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26 ## to different @var{y} values. |
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27 ## @seealso{meshgrid, contour} |
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28 ## @end deftypefn |
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29 |
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30 ## Author: jwe |
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31 |
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32 function h = mesh (x, y, z) |
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33 |
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34 newplot (); |
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35 |
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36 if (nargin == 1) |
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37 z = x; |
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38 if (ismatrix (z)) |
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39 [nr, nc] = size (z); |
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40 x = 1:nc; |
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41 y = (1:nr)'; |
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42 else |
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43 error ("mesh: argument must be a matrix"); |
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44 endif |
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45 elseif (nargin == 3) |
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46 if (isvector (x) && isvector (y) && ismatrix (z)) |
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47 if (rows (z) == length (y) && columns (z) == length (x)) |
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48 x = x(:)'; |
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49 y = y(:); |
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50 else |
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51 msg = "mesh: rows (z) must be the same as length (y) and"; |
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52 msg = sprintf ("%s\ncolumns (z) must be the same as length (x)", msg); |
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53 error (msg); |
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54 endif |
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55 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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56 if (! (size_equal (x, y) && size_equal (x, z))) |
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57 error ("mesh: x, y, and z must have same dimensions"); |
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58 endif |
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59 else |
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60 error ("mesh: x and y must be vectors and z must be a matrix"); |
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61 endif |
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62 else |
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63 print_usage (); |
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64 endif |
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65 |
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66 ## make a default line object, and make it the current axes for the |
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67 ## current figure. |
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68 ca = gca (); |
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69 |
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70 tmp = __go_surface__ (ca, "xdata", x, "ydata", y, "zdata", z); |
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71 |
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72 set (ca, "view", [-37.5, 30]); |
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73 |
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74 if (nargout > 0) |
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75 h = tmp; |
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76 endif |
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77 |
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78 endfunction |
