[R] Biplot: plot group name instead of row number

[Uwe Ligges]

On 21.10.2010 00:39, Alejo C.S. wrote:
> Dear list, I'm trying to make a biplot, but instead of plotting the row
> number for each observation, plot a group factor.
> Example:
>
>    prcomp(iris[,1:4]) ->  PCA
>    biplot(PCA) #this makes a nice biplot but with row names
>
> Instead of row numbers I want to plot iris[,5], which is a factor.
> I can do this:
>
> plot(PCA$x[,1], PCA$x[,2], type="n")
> text(PCA$x[,1], PCA$x[,2], labels=iris[,5], col=palette()[iris[,5]])
>
> Here I have a nice colored plot, but without the variable vectors.
> Any tip?


See ?biplot

  biplot(PCA, xlabs=iris[,5])


Uwe Ligges





> Thanks a lot in advance.
>
> Alejo
>
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