[R] assign unique size of point in xyplot

[hadley wickham]

On Thu, May 14, 2009 at 2:14 PM, Garritt Page <page2990 at gmail.com> wrote:
> Hello,I am using xyplot to try and create a conditional plot.  Below is a
> toy example of the type of data I am working with
>
> slevel <- rep(rep(c(0.5,0.9), each=2, times=2), times=2)
>
> tlevel <- rep(rep(c(0.5,0.9), each=4), times=2)
>
> noutliers <- rep(rep(c(2,4), times=4), times=2)
>
> analysis <- as.factor(rep(c('uv', 'mv'), each=8))
>
>
> cp <- c(0.9450,0.9525,0.9425,1.0000,0.9425,0.9410,0.900,0.800,0.9050,0.9020,
> 0.9040,0.9140,0.9400,0.9430,1.000,0.800 )
>
>
> area <- c(2.896485,4.952239,2.899030, 7.522729,2.827712, 4.950359,3.651156,
> 4.966610,2.85710, 6.649610 ,2.212295,2.778280,1.897921,  2.847249,1.777387,
> 2.418103)
>
>
>
> xyplot(cp  ~ noutliers|slevel*tlevel, group=analysis, cex=area,
>
> type='o', ylab="", col=c("red","blue"),
>
> xlab='',
>
>
>
> )
>
> This creates a trellis plot with four panels and four points in each panel.
>  I want the size of the points in each panel to be proportional to the value
> of area (simply putting cex=area in the xyplot function obviously isn't
> working).  I assume that I must create a customized panel function but
> haven't had any luck.  Any suggestions would be appreciated.

This is pretty easy to do in ggplot2:

library(ggplot2)
qplot(noutliers, cp, colour=analysis, size=area, facets = slevel ~ tlevel) +
  geom_line(size = 0.5)

Hadley


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