Hi, there! Can you please help me with a problem. I really don’t understand why this doesn’t work… When I create some function and then input it into my ParametricPlot, it doesn’t work, but when I input the expressions explicitly, it works. The screenshots are applied below.
Please post code, not images.
Try ClearAll[parX, parY, parZ] and then redefine them using := (SetDelayed) rather than = (Set).
From your screenshot it appears that the functions parX[t_] and parY[t_] returns a List
enclosing an expression in t. Not the “raw” expression itself. This does not work with ParametricPlot.
Compare:
ParametricPlot[{{Cos@t}, {Sin@t}}, {t, 0, 2 \[Pi]}]
Produces an empty plot
ParametricPlot[{Cos@t, Sin@t}, {t, 0, 2 \[Pi]}]
Plots a circle as expected
So, take away the enclosing curly brackets in the function definitions.