plot module: (C) 2001,2002 Sebastian Ritterbusch

You may plot 3d surface plots using the splot command:

 >f(x,y)=x*x-y*y;
 >splot[f;-2;2;-3;3;.2;.1];

This will plot f(x,y) from x in [-2,2] and y in [-3,3] with a step sizes of
.2 and .1 in x and y direction.

You may also save the plot in files:

 >plotOutput("surface.ps");
 >splot[f;-2;2;-3;3;.2;.1];