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1 # Copyright (C) 1993, 1994, 1995 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 the |
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7 # Free Software Foundation; either version 2, or (at your option) any |
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8 # later version. |
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9 # |
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 # 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 02111-1307, USA. |
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18 |
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19 function contour (z, n, x, y) |
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20 |
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21 # usage: contour (z, n, x, y) |
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22 # |
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23 # See also: plot, semilogx, semilogy, loglog, polar, mesh, contour, |
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24 # bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
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25 |
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26 |
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27 if (nargin == 1) |
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28 n = 10; |
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29 endif |
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30 |
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31 if (nargin == 1 || nargin == 2) |
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32 if (is_matrix (z)) |
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33 set nosurface; |
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34 set contour; |
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35 set cntrparam bspline |
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36 command = sprintf ("set cntrparam levels %d", n); |
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37 eval (command); |
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38 set noparametric; |
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39 set view 0, 0, 1.9, 1 |
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40 gsplot z w l 1; |
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41 else |
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42 error ("mesh: argument must be a matrix"); |
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43 endif |
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44 elseif (nargin == 4) |
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45 if (is_vector (x) && is_vector (y) && is_matrix (z)) |
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46 xlen = length (x); |
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47 ylen = length (y); |
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48 if (xlen == rows (z) && ylen == columns (z)) |
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49 if (rows (x) == 1) |
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50 x = x'; |
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51 endif |
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52 len = 3 * ylen; |
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53 zz = zeros (xlen, ylen); |
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54 k = 1; |
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55 for i = 1:3:len |
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56 zz(:,i) = x; |
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57 zz(:,i+1) = y(k) * ones (xlen, 1); |
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58 zz(:,i+2) = z(:,k); |
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59 k++; |
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60 endfor |
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61 set nosurface |
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62 set contour |
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63 set cntrparam bspline |
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64 command = sprintf ("set cntrparam levels %d", n); |
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65 eval (command); |
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66 set parametric; |
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67 set view 0, 0, 1.9, 1 |
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68 gsplot zz w l 1; |
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69 else |
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70 msg = "mesh: rows (z) must be the same as length (x) and"; |
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71 msg = sprintf ("%s\ncolumns (z) must be the same as length (y)", msg); |
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72 error (msg); |
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73 endif |
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74 else |
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75 error ("mesh: x and y must be vectors and z must be a matrix"); |
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76 endif |
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77 else |
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78 usage ("mesh (z, levels, x, y)"); |
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79 endif |
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80 |
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81 endfunction |
