[R] ggplot2 scatterplot matrix

[hadley wickham]

> plotmatrix(d[,3:6])
>
> I would like to either have a colour or more preferably a shape to
> correspond to Site
> this is what I have tried (along with many other combinations)
> plotmatrix(nmds.bug[,3:6])+scale_shape(nmds.bug, shape=Site, pch=1:12)

There's not really any easy way to do this in the current
implementation of plotmatrix.  I'm aiming to rewrite it to work more
like qplot, but that's still some ways away.

Hadley

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