[R] how to draw manifold?
Carl Witthoft
carl at witthoft.com
Sat Nov 20 17:29:48 CET 2010
Hi,
I need some help either in how to configure variables for wireframe(),
or some suggestions as to other graphics commands to use for plotting a
2-D manifold in 3-D space.
Here is an example I tried (in the hopes that it would plot a helical
line) :
xsp<-matrix(c(cos(seq(0,80)/5)),9,9)
ysp<-matrix(c(sin(seq(0,80)/5)),9,9)
zsp<-matrix(c((seq(0,80)/20)),9,9)
wireframe(zsp~xsp*ysp)
The resulting plot looks vaguely like a helix, but not right. And if I
change my variables' dimensions to c(3,27) it looks "better," but if the
dims are c(1,81), nothing gets plotted.
So: is there a way to control which points are connected by lines in
wireframe()? Or is there a more appropriate way to provide a plotting
program with sets of coordinates in 3-space?
My primary goal is to be able to plot surfaces, not just a line as in my
sample code. For example, I might expand the data above to represent
points on a 'ribbon' helix.
Thanks for yr. help -- feel free to point me to help files for existing
packages or plotting routines.
Carl
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