How can I divide the colorbar into just two ranges?

How can I set the colorbar to show me only two ranges, for example one smaller than 0.05 and the other larger than 0.05?

Answer 1

[Cris LaPierre]

The number of colors is controled by your colormap. However, MATLAB spreads the colormap evenly over the range of data plotted. If you want the transition to occur as a specific value, you will likely need to manually specify the color property of your figure.

Here's an example using surf.

p = peaks;
C = p>=0.05;
surf(p,C+1)
colormap(parula(2))
colorbar('Ticks',[1,1.5,2],'TickLabels',[-10,0.05,10])

The actual solution will depend greatly on the type of figure you are tyring to create.

Answer 2

[DGM]

One way is to specify the colormap and caxis(); consider the example

[x y z] = sphere(30);

surf(x,y,z);
axis equal

datarange = [-1 1];
breakpoint = 0.5;

ctlen = 256;
colors = [0 0 1; 0 1 1];
pos = (max(datarange)-breakpoint)/diff(datarange);
n = [floor(ctlen*(1-pos)) ceil(ctlen*pos)];
cmap = [repmat(colors(1,:),[n(1),1]); repmat(colors(2,:),[n(2),1])];

colormap(cmap);
caxis(datarange)
colorbar

Doing it this way allows you to control the breakpoint position independently of the caxis endpoints.