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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} {} meshc (@var{x}, @var{y}, @var{z}) |
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21 ## Plot a mesh and contour given matrices @var{x}, and @var{y} from |
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22 ## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and |
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23 ## @var{y} coordinates of the mesh. If @var{x} and @var{y} are vectors, |
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24 ## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, |
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25 ## columns of @var{z} correspond to different @var{x} values and rows of |
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26 ## @var{z} correspond to different @var{y} values. |
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27 ## @seealso{meshgrid, mesh, contour} |
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28 ## @end deftypefn |
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29 |
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30 function h = meshc (varargin) |
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31 |
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32 newplot (); |
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33 |
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34 if (nargin == 1) |
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35 z = varargin{1}; |
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36 if (ismatrix (z)) |
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37 [nr, nc] = size (z); |
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38 x = 1:nc; |
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39 y = (1:nr)'; |
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40 else |
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41 error ("meshc: argument must be a matrix"); |
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42 endif |
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43 elseif (nargin == 3) |
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44 x = varargin{1}; |
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45 y = varargin{2}; |
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46 z = varargin{3}; |
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47 |
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48 if (isvector (x) && isvector (y) && ismatrix (z)) |
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49 if (rows (z) == length (y) && columns (z) == length (x)) |
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50 x = x(:)'; |
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51 y = y(:); |
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52 else |
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53 msg = "meshc: rows (z) must be the same as length (y) and"; |
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54 msg = sprintf ("%s\ncolumns (z) must be the same as length (x)", msg); |
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55 error (msg); |
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56 endif |
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57 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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58 if (! (size_equal (x, y) && size_equal (x, z))) |
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59 error ("meshc: x, y, and z must have same dimensions"); |
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60 endif |
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61 else |
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62 error ("meshc: x and y must be vectors and z must be a matrix"); |
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63 endif |
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64 else |
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65 print_usage (); |
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66 endif |
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67 |
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68 ## make a default line object, and make it the current axes for the |
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69 ## current figure. |
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70 ca = gca (); |
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71 |
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72 tmp = __go_surface__ (ca, "xdata", x, "ydata", y, "zdata", z); |
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73 |
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74 set (ca, "view", [-37.5, 30]); |
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75 |
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76 hold on; |
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77 |
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78 [c, lev] = contourc (varargin{:}); |
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79 |
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80 cmap = get (gcf(), "colormap"); |
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81 |
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82 levx = linspace (min (lev), max (lev), size (cmap, 1)); |
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83 |
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84 drawnow(); |
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85 ax = axis(); |
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86 zmin = 2 * ax(5) - ax(6); |
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87 |
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88 ## decode contourc output format |
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89 i1 = 1; |
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90 while (i1 < length (c)) |
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91 |
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92 clev = c(1,i1); |
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93 clen = c(2,i1); |
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94 |
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95 ccr = interp1 (levx, cmap(:,1), clev); |
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96 ccg = interp1 (levx, cmap(:,2), clev); |
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97 ccb = interp1 (levx, cmap(:,3), clev); |
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98 |
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99 ii = i1+1:i1+clen; |
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100 line (c(1,ii), c(2,ii), zmin*ones(size(ii)), "color", [ccr, ccg, ccb]); |
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101 |
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102 i1 += c(2,i1)+1; |
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103 endwhile |
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104 |
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105 if (nargout > 0) |
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106 h = tmp; |
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107 endif |
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108 endfunction |
