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Question: What does "Error, (in plot3d) bad range arguments" mean?

Question:What does "Error, (in plot3d) bad range arguments" mean?

cstjohn 0 Maple 16
October 25 2012
0

So, my code is this:

u := u1+(u2-u1)*JacobiSN((1/2)*phi*sqrt(s*(u3-u1)), k)^2;

r := 1/u 

where u1,u2, u3, s, and k, are just some constants

and here is where I think it's having problems 

Top := [r*cos(v), r*sin(v), 2*sqrt(s*(r-s))];
Bottom := [r*cos(v), r*sin(v)-2*sqrt(s*(r-s))]
figure(22) := plot3d([Top, Bottom], r = s .. 20, v = 0 .. 2*Pi)

It gives me this error: 

 

Error, (in plot3d) bad range arguments: 1/(1/22+(1/11)*JacobiSN((1/308)*phi*21406^(1/2), (1/139)*834^(1/2))^2) = 3/7 .. 20, v = 0 .. 2*Pi.   

I am not too famililar with Maple and I think it has something to do with how I defined the parameter r but I don't know what exactly is wrong with it.  

 
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