On Jul 13, 2011, at 6:08 PM, amenning wrote:
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.
Well, I don't know if anyone has done a paracurve, but surely this
delivers an expected 2D result with plot():
plot(sin(seq(0, 2*pi, by=0.01)), cos(seq(0, 2*pi, by=0.01)))
I have also see the scatterplot developers demonstrate helices in 3D:
(from the Ligges article at citeseer ... and probably ,many other
sites):
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.150.4841&rep=rep1&type=pdf
library(scatterplot3d)
z <- seq(-10, 10, 0.01)
x <- cos(z)
y <- sin(z)
scatterplot3d(x, y, z, highlight.3d = TRUE, col.axis = "blue",
col.grid = "lightblue", main = "Helix", pch = 20)
Yep ..... still works.
Toni Menninger
Department of Geosciences
University of Arkansas
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