# How to move vector onto a curve at a specified point

I have the following code:

ParametricPlot3D[{3*Cos[t]/5, Sin[t], 4*Cos[t]/5}, {t, 0, 2 π}]
data = {{0.55, -0.38, 0.74}, {4/5, 0, -3/5}, {-.23, -.92, -.31}};
Graphics3D[Arrow[{{0, 0, 0}, #}] & /@ data]


I need to combine these two 3D sketchs, the parametric curve and the vectors.

I want to put these three vectors on the {3*Cos[t]/5, Sin[t], 4*Cos[t]/5}, parametric curve at a certain point; i.e., at the parameter t = π/2.

• The Show command can combine 3D graphics objects. – John McGee Mar 31 '17 at 18:41
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• You can format inline code and code blocks by selecting the code and clicking the {} button above the edit window. The edit window help button ? is useful for learning how to format your questions and answers. You may also find this meta Q&A helpful – Michael E2 Mar 31 '17 at 19:01

f[t_] := {3*Cos[t]/5, Sin[t], 4*Cos[t]/5}