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