How can I divide the colorbar into just two ranges?

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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?

Answers (2)

Cris LaPierre
Cris LaPierre on 11 Jun 2021
Edited: Cris LaPierre on 11 Jun 2021
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.

DGM
DGM on 11 Jun 2021
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.

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