blue to red colormap
cmap=jetcolormap(n)
:n integer >= 3, the colormap size. : :cmap matrix with 3 columns [R,G,B]. :
jetcolormap computes a colormap with n colors varying from blue, lightblue, green, yellow, orange then red
f = `scf`_();
`plot3d1`_();
f.color_map = jetcolormap(32);