[R] Highlighting points in a scatter plot matrix

[Uwe Ligges]

Brett Stansfield wrote:
> Dear R
> I recently did a scatterplot matrix using the following command
> pairs(sleep[c("SlowSleep", "ParaSleep", "logbw", "logbrw", "loglife",
> "loggest")],col=1+as.integer(ParaSleep > 5.5 | SlowSleep > 15.7))
> this highlighted outlying points for some of the x,y plots that I needed to
> identify. Unfortunately this highlights all the x,y plots some for which
> these points are not necessarily outliers. Is there a way to specify
> highlighting selected points at selected x,y plots within a matrix?

It's tricky, you would have to specify your own panel functions, 
probably even better using lattice.



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