2008/5/15 Krzysztof Le?niak <much at mat.uni.torun.pl>:
> I cannot obtain the 3d plotting of 2 functions (and more functions too):
>
> plot3d([7*x-3*y, x^2-y^2], [x,-5,5], [y,-5,5])$
>
> List [7*x-3*y,x^2-y^2] is not of length 3 -- an error. To debug this
> try debugmode(true);
plot3d can't plot multiple surfaces. You can use the draw package:
load(draw)$
draw3d(
color=red,
explicit(7*x-3*y, x, -5, 5, y, -5, 5),
color=blue,
explicit(x^2-y^2, x, -5, 5, y, -5, 5))$
--
Andrej