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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, 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: contour (z, n, x, y) |
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21 ## |
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22 ## See also: plot, semilogx, semilogy, loglog, polar, mesh, contour, |
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23 ## bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
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24 |
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25 ## Author: jwe |
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26 |
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27 function contour (z, n, x, y) |
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28 |
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29 if (nargin == 1) |
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30 n = 10; |
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31 endif |
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32 |
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33 ## XXX FIXME XXX -- these plot states should really just be set |
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34 ## temporarily, probably inside an unwind_protect block, but there is |
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35 ## no way to determine their current values. |
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36 |
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37 if (nargin == 1 || nargin == 2) |
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38 if (is_matrix (z)) |
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39 gset nosurface; |
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40 gset contour; |
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41 gset cntrparam bspline; |
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42 command = sprintf ("gset cntrparam levels %d", n); |
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43 eval (command); |
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44 gset noparametric; |
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45 gset view 0, 0, 1, 1; |
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46 gsplot z w l 1; |
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47 else |
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48 error ("contour: argument must be a matrix"); |
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49 endif |
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50 elseif (nargin == 4) |
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51 if (is_vector (x) && is_vector (y) && is_matrix (z)) |
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52 xlen = length (x); |
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53 ylen = length (y); |
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54 if (xlen == rows (z) && ylen == columns (z)) |
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55 if (rows (x) == 1) |
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56 x = x'; |
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57 endif |
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58 len = 3 * ylen; |
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59 zz = zeros (xlen, len); |
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60 k = 1; |
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61 for i = 1:3:len |
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62 zz(:,i) = x; |
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63 zz(:,i+1) = y(k) * ones (xlen, 1); |
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64 zz(:,i+2) = z(k,:)'; |
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65 k++; |
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66 endfor |
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67 gset nosurface; |
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68 gset contour; |
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69 gset cntrparam bspline; |
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70 command = sprintf ("gset cntrparam levels %d", n); |
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71 eval (command); |
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72 gset parametric; |
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73 gset view 0, 0, 1, 1; |
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74 gsplot zz w l 1; |
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75 else |
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76 msg = "contour: rows (z) must be the same as length (x) and"; |
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77 msg = sprintf ("%s\ncolumns (z) must be the same as length (y)", msg); |
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78 error (msg); |
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79 endif |
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80 else |
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81 error ("contour: x and y must be vectors and z must be a matrix"); |
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82 endif |
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83 else |
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84 usage ("contour (z, levels, x, y)"); |
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85 endif |
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86 |
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87 endfunction |
