Re: [R] highlighting subset of point with xyplot (or Hmisc(xYplot))

From: Deepayan Sarkar <deepayan_at_stat.wisc.edu>
Date: Sat 17 Jul 2004 - 07:42:21 EST

On Friday 16 July 2004 16:32, Patrick Lorch wrote:
> Hello all,
> I am trying to use xyplot to give a six panel plot and to highlight
> only points (in any panel) that meet a certain criterion. With the
> plot command I would do something like:
> plot.default(filein$Site,filein$circ.conc)
> points(filein$Site,filein$circ.conc,type="p",
> pch=ifelse(filein$p.value<5e-02,19,21))
> I had thought I could just stick in the pch line from above into either
> xyplot or xYplot with groups set to Site like:
> xyplot(circ.conc~Day|Site,data=allsites.byday,groups=Site,
> pch=ifelse(allsites.byday$p.value<5e-02,19,21))
> This does not produce any highlighting (all symbols come out as open
> circles (19)). I have not messed with writing my own panel functions,
> though I know that is where the solution must lie. Hopefully someone
> has an example that is close enough to help me. I can send an example
> plot to anyone that wants one.

It's difficult to check without data, but I believe the following would work:

xyplot(circ.conc ~ Day | Site, data=allsites.byday,

       ## groups=Site, I don't see the point of this
       groups = p.value<5e-02, 
       pch = c(19, 21))

Note that I have removed the original groups variable, because I don't see a point in having that (since Site is already used as a conditioning variable). If you really need another grouping variable, then this would become slightly more complicated.

Deepayan



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