On 9/2/2008 12:42 PM, Raphael Fraser wrote: > Can R plot 3D graphs? If so, how would you plot x^2 + y^2 + z^2 = 1? There are several ways. Plotting a function z = f(x,y) is easiest; persp or image or contour can do that. Plotting a general surface is harder, but there are examples of how to do this in ?persp3d in the rgl package. Duncan Murdoch