cmap = jet(m)
jet(m) returns an m-by-3 matrix containing the jet colormap. This colormap begins with blue, and passes through cyan, yellow, orange, and red. The default value for m is the length of the current colormap.
colormap(jet)
bone,colormap,cool,copper,flag,gray,hot,hsv,pink,prism,white
(c) Copyright 1994 by The MathWorks, Inc.