[Rd] colour palettes in biplot

[G. Sawitzki]

biplot could benefit from allowing colour palettes,

eg. allowing col=list(xcol= xxpal, ycol= yypal) where xxpal and yypal
are palettes.

For an example, see the robust pricipal components in the principal
componetent section of
	<http://www.statlab.uni-heidelberg.de/data/olive/olive10.pdf>


The required change is to replace
col[1L] resp. col[2L] by col[1L]] reep. col[[2L]] for example in

 plot(x, type = "n", xlim = xlim, ylim = ylim, col = col[[1L]], ## <<
         xlab = xlab, ylab = ylab, sub = sub, main = main, ...)


Existing code should not be broken by this change.

Yours,
  gs.


>From valentin.todorov at chello.at:
> library(rrcov)
> 
> pc <- PcaProj(iris[,1:4], 3, scale=TRUE)
> windows(8,5)
> par(mfrow=c(1,2))
> biplot(pc)
> 
> col <- list(xcol=as.numeric(iris[,5])+2, ycol="red")
> biplot(pc, col=col)
> 

-- 
G. Sawitzki
StatLab Heidelberg
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