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1 ### Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA |
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18 ### 02111-1307, USA. |
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19 |
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20 ## usage: mesh (x, y, z) |
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21 ## |
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22 ## Surface plot. If x, y, and z are matrices with the same dimensions, |
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23 ## then corresponding elements represent vertices of the plot. If x and |
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24 ## y are vectors, then a typical vertex is (x(j), y(i), z(i,j)). Thus, |
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25 ## columns of z correspond to different x values and rows of z correspond |
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26 ## to different y values. |
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27 ## |
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28 ## See also: plot, semilogx, semilogy, loglog, polar, meshgrid, meshdom, |
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29 ## contour, bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
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30 |
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31 function mesh (x, y, z) |
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32 |
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33 if (nargin == 1) |
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34 z = x; |
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35 if (is_matrix (z)) |
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36 set hidden3d; |
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37 set data style lines; |
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38 set surface; |
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39 set nocontour; |
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40 set noparametric; |
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41 set view 60, 30, 1, 1 |
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42 gsplot (z'); |
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43 else |
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44 error ("mesh: argument must be a matrix"); |
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45 endif |
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46 elseif (nargin == 3) |
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47 if (is_vector (x) && is_vector (y) && is_matrix (z)) |
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48 xlen = length (x); |
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49 ylen = length (y); |
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50 if (xlen == columns (z) && ylen == rows (z)) |
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51 if (rows (y) == 1) |
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52 y = y'; |
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53 endif |
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54 len = 3 * xlen; |
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55 zz = zeros (ylen, len); |
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56 k = 1; |
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57 for i = 1:3:len |
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58 zz(:,i) = x(k) * ones (ylen, 1); |
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59 zz(:,i+1) = y; |
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60 zz(:,i+2) = z(:,k); |
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61 k++; |
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62 endfor |
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63 set hidden3d; |
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64 set data style lines; |
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65 set surface; |
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66 set nocontour; |
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67 set parametric; |
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68 set view 60, 30, 1, 1 |
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69 gsplot (zz); |
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70 else |
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71 msg = "mesh: rows (z) must be the same as length (x) and"; |
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72 msg = sprintf ("%s\ncolumns (z) must be the same as length (y)", msg); |
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73 error (msg); |
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74 endif |
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75 elseif (is_matrix (x) && is_matrix (y) && is_matrix (z)) |
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76 xlen = columns (z); |
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77 ylen = rows (z); |
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78 if (xlen == columns (x) && xlen == columns (y) && |
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79 ylen == rows (x) && ylen == rows(y)) |
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80 len = 3 * xlen; |
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81 zz = zeros (ylen, len); |
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82 k = 1; |
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83 for i = 1:3:len |
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84 zz(:,i) = x(:,k); |
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85 zz(:,i+1) = y(:,k); |
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86 zz(:,i+2) = z(:,k); |
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87 k++; |
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88 endfor |
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89 set hidden3d; |
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90 set data style lines; |
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91 set surface; |
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92 set nocontour; |
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93 set parametric; |
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94 set view 60, 30, 1, 1 |
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95 gsplot (zz); |
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96 else |
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97 error ("mesh: x, y, and z must have same dimensions"); |
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98 endif |
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99 else |
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100 error ("mesh: x and y must be vectors and z must be a matrix"); |
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101 endif |
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102 else |
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103 usage ("mesh (z)"); |
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104 endif |
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105 |
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106 endfunction |
