1 ## Copyright (C) 2007-2012 Kai Habel
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} pcolor (@var{x}, @var{y}, @var{c})
21 ## @deftypefnx {Function File} {} pcolor (@var{c})
22 ## Density plot for given matrices @var{x}, and @var{y} from @code{meshgrid} and
23 ## a matrix @var{c} corresponding to the @var{x} and @var{y} coordinates of
24 ## the mesh's vertices. If @var{x} and @var{y} are vectors, then a typical
26 ## is (@var{x}(j), @var{y}(i), @var{c}(i,j)). Thus, columns of @var{c}
27 ## correspond to different @var{x} values and rows of @var{c} correspond
28 ## to different @var{y} values.
30 ## The @code{colormap} is scaled to the extents of @var{c}.
31 ## Limits may be placed on the color axis by the
32 ## command @code{caxis}, or by setting the @code{clim} property of the
35 ## The face color of each cell of the mesh is determined by interpolating
36 ## the values of @var{c} for the cell's vertices. Contrast this with
37 ## @code{imagesc} which renders one cell for each element of @var{c}.
39 ## @code{shading} modifies an attribute determining the manner by which the
40 ## face color of each cell is interpolated from the values of @var{c},
41 ## and the visibility of the cells' edges. By default the attribute is
42 ## "faceted", which renders a single color for each cell's face with the edge
45 ## @var{h} is the handle to the surface object.
47 ## @seealso{caxis, contour, meshgrid, imagesc, shading}
50 ## Author: Kai Habel <kai.habel@gmx.de>
52 function h = pcolor (x, y, c)
60 [x, y] = meshgrid (1:nc, 1:nr);
67 tmp = surface (x, y, z, c);
69 ax = get (tmp, "parent");
71 set (tmp, "facecolor", "flat");
72 set (ax, "box", "on");
75 set (ax, "view", [0, 90]);
92 %! [Fx,Fy] = gradient(Z);