When you create surface plots using functions such as
you can easily change the color scheme by calling the
colormap function. After you have selected
a color scheme, you can change the direction or pattern of the colors
across the surface.
CData property of a
contains an indexing array
C that associates specific
locations in your plot with colors in the colormap.
the following relationship to the surface z = f(x,y):
C is the same size as
Z is the array containing the values of f(x,y)
at each grid point on the surface.
The value at
C(i,j) controls the
color at the grid location
(i,j) on the surface.
C is equal to
which corresponds to colors varying with altitude.
By default, the range of
linearly to the number of rows in the colormap array.
For example, a 3-by-3 sampling of
Z = X +
Y has the following relationship to a colormap containing
Notice that the smallest
-2) maps to the first row in the colormap.
The largest value (
2) maps to the last row in the
colormap. The intermediate values in
C map linearly
to the intermediate rows in the colormap.
The preceding surface plot shows how colors are assigned to
vertices on the surface. However, the default behavior is to fill
the patch faces with solid color. That solid color is based on the
colors assigned to the surrounding vertices. For more information,
When using the default value of
C=Z, the colors vary with changes in
[X,Y] = meshgrid(-10:10); Z = X + Y; s = surf(X,Y,Z); xlabel('X'); ylabel('Y'); zlabel('Z');
You can change this behavior by specifying
C when you create the surface. For example, the colors on this surface vary with
C = X; s = surf(X,Y,Z,C); xlabel('X'); ylabel('Y'); zlabel('Z');
Alternatively, you can set the
CData property directly. This command makes the colors vary with
s.CData = Y;
The colors do not need to follow changes in a single dimension. In fact,
CData can be any array that is the same size as
Z. For example, the colors on this plane follow the shape of a sinc function.
R = sqrt(X.^2 + Y.^2) + eps; s.CData = sin(R)./(R);