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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 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} {} mesh (@var{x}, @var{y}, @var{z}) |
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22 ## Plot a mesh given matrices @var{x}, and @var{y} from @code{meshgrid} and |
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23 ## a matrix @var{z} corresponding to the @var{x} and @var{y} coordinates of |
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24 ## the mesh. If @var{x} and @var{y} are vectors, then a typical vertex |
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25 ## is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns of @var{z} |
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26 ## correspond to different @var{x} values and rows of @var{z} correspond |
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27 ## to different @var{y} values. |
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28 ## @seealso{meshgrid, contour} |
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29 ## @end deftypefn |
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30 |
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31 ## Author: jwe |
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32 |
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33 function mesh (x, y, z) |
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34 |
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35 if (nargin == 1) |
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36 z = x; |
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37 if (ismatrix (z)) |
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38 [x, y] = meshgrid(0:columns(z)-1, 0:rows(z)-1); |
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39 else |
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40 error ("mesh: argument must be a matrix"); |
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41 endif |
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42 elseif (nargin == 3) |
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43 if (isvector (x) && isvector (y) && ismatrix (z)) |
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44 if (rows (z) == length (y) && columns (z) == length (x)) |
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45 x = repmat(x(:)', length (y), 1); |
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46 y = repmat(y(:), 1, length (x)); |
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47 else |
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48 msg = "mesh: rows (z) must be the same as length (y) and"; |
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49 msg = sprintf ("%s\ncolumns (z) must be the same as length (x)", msg); |
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50 error (msg); |
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51 endif |
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52 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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53 if (ndims (x) != ndims (y) || ndims (x) != ndims (z) |
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54 || size (x) != size (y) || size (x) != size (z)) |
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55 error ("mesh: x, y, and z must have same dimensions"); |
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56 endif |
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57 else |
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58 error ("mesh: x and y must be vectors and z must be a matrix"); |
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59 endif |
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60 else |
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61 print_usage (); |
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62 endif |
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63 |
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64 ## Show the mesh. |
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65 xlen = columns (z); |
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66 ylen = rows (z); |
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67 if (xlen == columns (x) && xlen == columns (y) |
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68 && ylen == rows (x) && ylen == rows (y)) |
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69 len = 3 * xlen; |
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70 zz = zeros (ylen, len); |
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71 k = 1; |
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72 for i = 1:3:len |
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73 zz(:,i) = x(:,k); |
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74 zz(:,i+1) = y(:,k); |
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75 zz(:,i+2) = z(:,k); |
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76 k++; |
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77 endfor |
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78 __gnuplot_raw__ ("set hidden3d;\n"); |
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79 __gnuplot_raw__ ("set data style lines;\n"); |
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80 __gnuplot_raw__ ("set surface;\n"); |
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81 __gnuplot_raw__ ("set nocontour;\n"); |
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82 __gnuplot_raw__ ("set nologscale;\n"); |
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83 __gnuplot_set__ parametric; |
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84 __gnuplot_raw__ ("set view 60, 30, 1, 1;\n"); |
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85 __gnuplot_raw__ ("set palette defined (0 \"dark-blue\", 1 \"blue\", 2 \"cyan\", 3 \"yellow\", 4 \"red\" , 5 \"dark-red\");\n"); |
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86 __gnuplot_raw__ ("set nocolorbox;\n"); |
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87 __plt3__ (zz, "", "", "", |
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88 sprintf ("%s line palette", gnuplot_command_with ())); |
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89 else |
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90 error ("mesh: x, y, and z must have same dimensions"); |
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91 endif |
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92 |
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93 endfunction |
