Color 3-D Bars by Height

This example shows how to modify a 3-D bar plot by coloring each bar according to its height.

Create a 3-D bar graph of data from the magic function. Return the surface objects used to create the bar graph in array b. Add a colorbar to the graph.

Z = magic(5);
b = bar3(Z);

For each surface object, get the array of z-coordinates from the ZData property. Use the array to set the CData property, which defines the vertex colors. Interpolate the face colors by setting the FaceColor properties of the surface objects to 'interp'.

Note: Starting in R2014b, you can use dot notation to query and set properties. If you are using an earlier release, use the get and set functions instead, such as zdata = get(b(k),'ZData').

for k = 1:length(b)
    zdata = b(k).ZData;
    b(k).CData = zdata;
    b(k).FaceColor = 'interp';

The height of each bar determines its color. You can estimate the bar heights by comparing the bar colors to the colorbar.

See Also