add new colors to the current colormap
new=addcolor(c)
:new ids of the colors defined in c in the new color table. : :c matrix with 3 columns, RGB color definition. :
addcolor adds new colors given in the c argument to the current colormap. c must be a matrix with 3 columns [R G B] R is red component, G is green component, B is blue component). Each entry in c must be a non negative number less or equal to 1.
The ids of the new colors are returned into new.
If a color defined in c is already present in the current colormap it is not added.
`plot3d`_();
h = `gcf`_();
h.color_map = `jetcolormap`_(16);
addcolor(`name2rgb`_('grey')/255);