Specializing color map for positive and negative asymmetric data

Hi, How I can specialize two colormap for positive and negative data? For example, colormap(gray) for [0 36] , and colormap(pink) for [-23.5 0].

As I am NOT using pcolor, I can not plot it twice on one figure with 'hold on'. I am using colormesh2d which is a function that plots elevations on a finite element mesh.

Any thoughts is appreciated.

Answer 1

[Walter Roberson]

caxis([-23.5 36])
cmap = [pink(23.5*2); gray(36*2)];
colormap(cmap)

If I have worked out the boundaries correctly, this should give you the colormap you requested.

The logic here is that each 0.5 is allocated a colormap slot, so [-23.5 -23), [-23 -22.5), [-22.5 -22) and so on up to [-0.5 0), 47 entries in total that are allocated pink entries. [0, 0.5), [0.5, 1), [1, 1.5) and so on follow up to [35.5 36), 72 entries of gray map.

[So Ko]

Thank you very much. It was a nice trick.