R help - Nov 2010 - how to draw manifold?

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

Hi:

Here's an example stolen out of the scatterplot3d package vignette (p. 9):

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)

HTH,
Dennis

On Sat, Nov 20, 2010 at 8:29 AM, Carl Witthoft <carl@witthoft.com> wrote:
> 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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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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