Re: [R] 3D graphics with R

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From: Jonathan Baron (baron@cattell.psych.upenn.edu)
Date: Sun 19 May 2002 - 08:39:16 EST 

Message-id: <20020518183916.A8086@cattell.psych.upenn.edu>

On 05/18/02 23:25, Johannes Schulte wrote:
>Is there any graphical frontend/secondary programm (freely availible for
>Windowsor Linux) which can be used with R to display the results of a
>principle component analysis in 3D space (rotatable!?)? It works with
>Spotfire, but is there any freely or cheaply availible programmß

I don't think so. But take a look at biplot in the mva package,
which produces VERY interesting plots in _two_ dimensions, and
the xgobi package, which produces 3D plots that can be rotated
(as I recall - I find these too mind-boggling to deal with, so I
don't use it anymore). Perhaps you can make a "triplot"
function.

For data with more than 2 dimensions, I find "matplot" (in the
base package) to be more useful than xgobi (at least for my small
brain, which has trouble visualizing in 3D). I haven't thought
about how to use this to display principal components, but I'm
sure there is a way (with loadings()). 

-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
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