It provide a variety of colormaps. It can be used for many plot applications.
In addition, it can be used to convert from a gray image to a pseudo color image.
Run demo.m!

Usage of colormap:
colormap(ax1,colormapformulae('traditional ', 2560));
or
colormap(ax1,colormapformulae([7,5,15], 2560));

It includes builtin colormap like 'cool'.
colormap(ax1,colormapformulae('cool', 2560));

Usage of pseudo color conversion:
col = gray2pseudocolor(gry,'traditional');
or
col = gray2pseudocolor(gry,[7,5,15]);

The numbers [7,5,15] specifiy the transformation functions of R, G, and B.
You can get different colormap by changing the numbers.

Each function includes help.
Please type:
% help [function]