The curve() function plots an expression in x over an interval [from,to]. I
am looking for a function that would allow me to plot a parametrized curve
t -> x(t) where x is a vector in 2 or 3 dimensions.

  For example (cos(t), sin(t)) (a2D  circle) or (cos(t), sin(t), t) (a 3D
helix). It seems that neither curve(), plot(), nor persp() are helpful for
that particular problem. I bet I?m not the first one missing this
functionality and it probably already exists somewhere. Thanks for any
hints.

  Toni Menninger
  Department of Geosciences
  University of Arkansas

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