ParametricPlot3D won't show [closed]

I want to see the image of a tube made from a space curve. I define the surface using Frenet-Serret frame but the software does not show me the plot. What might be wrong with my code?

Thank you.

closed as off-topic by bbgodfrey, Karsten 7., Bob Hanlon, Sjoerd C. de Vries, Michael E2Apr 12 '15 at 16:06

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – bbgodfrey, Karsten 7., Bob Hanlon, Sjoerd C. de Vries
If this question can be reworded to fit the rules in the help center, please edit the question.

• can you post the code for the plot please, thx – penguin77 Apr 12 '15 at 13:01
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• Perhaps adding the underscores in the definition of T2 might help. – Sjoerd C. de Vries Apr 12 '15 at 14:40
• possible duplicate of Extruding along a path – Michael E2 Apr 12 '15 at 16:06
• It is not because I wasn't looking for the use of Tube command, I needed a mathematical expression. – thedude Apr 12 '15 at 16:09

You need to define c and to use the correct syntax in the definition of T2:

T2[s_, y_] := r[s] + 2*(c[s]*Sin[y] - j[s]*Cos[y])
c[s_] := s; (* for example *)
ParametricPlot3D[Evaluate@T2[s, y], {s, 0, 2*Pi}, {y, 0, 2*Pi}] Update: For the updated version of the question:

ClearAll[r, s, j, v, T2, y]
r[s_] := {-(5 + 2*Cos[2*s])*Sin[3*s], (5 + 2*Cos[2*s])*Cos[3*s],
2*Sin[2*s]}
j[s_] := Normalize[Cross[r'[s], r''[s]]]
v[s_] := Normalize[Cross[j[s], Normalize[r'[s]]]]
T2[s_, y_] := r[s] + 1*(j[s]*Sin[y] - v[s]*Cos[y])

ParametricPlot3D[Evaluate@T2[s, y], {s, 0, 2*Pi}, {y, 0, 2*Pi}] 