[R] "biplot" graphical options?

[Meyners, Michael, LAUSANNE, AppliedMathematics]

Taking the example from ?biplot.princomp with reproducible code (hint,
hint):

biplot(princomp(USArrests))
biplot(princomp(USArrests), col=c(2,3), cex=c(1/2, 2)) 

clearly changes the color and font size on my system. For changing the
"point symbols" (which are text by default), try setting xlabs and
ylabs. But of course, an argument "pch" will not have any effect, as
biplot does have no call to "points" or similar, but to "text" only (and
hence mainly parameters of "text" will have an effect on what you aim
at). So for documentation, I'd propose ?biplot.princomp and
?biplot.default.

For changes that are truly impossible (there are indeed some), take the
code for biplot.default (or biplot.princomp) and amend where necessary
to fulfill your needs. 

HTH, Michael

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Manca Marco (PATH)
> Sent: Mittwoch, 2. September 2009 13:02
> To: r-help at r-project.org
> Subject: [R] "biplot" graphical options?
> Importance: High
> 
> 
> Dear R-help fellows
> 
> good afternoon.
> 
> I am struggling in the attempt to impose some graphical 
> conditions (changing point symbols, colors, etc) to biplot 
> function (I am using it to visualize the results of princomp) 
> but I can't apparently manage to change anything but the 
> axis... and I have been browsing manuals and vignettes 
> without finding any explicit suggestions on how to operate...
> 
> Can anyone, please, point my attention to the relevant documentation?
> 
> Thank you in advance and best regards,
> Marco
> 
> --
> Marco Manca, MD
> University of Maastricht
> Faculty of Health, Medicine and Life Sciences (FHML) 
> Cardiovascular Research Institute (CARIM) PO Box 616 6200 MD 
> Maastricht
> 
> E-mail: m.manca at path.unimaas.nl
> Office telephone: +31(0)433874633
> Personal mobile: +31(0)626441205
> Twitter: @markomanka
> 
> 
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