Last week I asked about data ellipses with rgl:::ellipse3d() with lines
showing the principal axes.
(The goal is a visual demonstration of PCA as a rotation of variable
space to component space.)
I was trying, unsuccessfully, to use princomp() to generate the PCA axes
and plot them using
Michael Friendly wrote:
Last week I asked about data ellipses with rgl:::ellipse3d() with lines
showing the principal axes.
(The goal is a visual demonstration of PCA as a rotation of variable
space to component space.)
I was trying, unsuccessfully, to use princomp() to generate the PCA axes
Duncan Murdoch wrote:
The normals component contains the surface normals. It is used to
help in rendering the surface, but isn't much use for your purposes.
Unfortunately, I'm not familiar enough with the internals of princomp
to tell you how to get the axes you want.
Duncan Murdoch
OK,
On 24/09/2008 10:12 AM, Michael Friendly wrote:
Duncan Murdoch wrote:
The normals component contains the surface normals. It is used to
help in rendering the surface, but isn't much use for your purposes.
Unfortunately, I'm not familiar enough with the internals of princomp
to tell you how to
On 24/09/2008 11:11 AM, Duncan Murdoch wrote:
On 24/09/2008 10:12 AM, Michael Friendly wrote:
Duncan Murdoch wrote:
The normals component contains the surface normals. It is used to
help in rendering the surface, but isn't much use for your purposes.
Unfortunately, I'm not familiar enough
Thanks Duncan ( others)
Here is a function that does what I want in this case, and tries to do
it to work generally
with ellipse3d. (Note that I reverse the order of centre and scale
'cause I was bitten
by trying ellipse3d.axes(cov, mu))
# draw axes in the data ellipse computed by ellipse3d
On 24/09/2008 12:32 PM, Michael Friendly wrote:
Thanks Duncan ( others)
Here is a function that does what I want in this case, and tries to do
it to work generally
with ellipse3d. (Note that I reverse the order of centre and scale
'cause I was bitten
by trying ellipse3d.axes(cov, mu))
#
of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On
Behalf Of Michael Friendly
Sent: September-24-08 9:24 AM
To: R-Help
Subject: [R] rgl: ellipse3d with axes
Last week I asked
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