Mark -
If I understand what you want, it can be done with a custom
panel function:
mypanel = function(x,subscripts,groups,...){
panel.densityplot(x,plot.points=FALSE,groups=groups,subscripts=subscripts,...)
panel.rug(x,col=trellis.par.get('superpose.line')$col[groups[subscripts]])
}
Then I think you'll get the result you want if you use
densityplot(~Value|Type, group=Category, data=d, panel=mypanel)
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Thu, 16 Dec 2010, Mark Dalphin wrote:
Hi All,
I'm trying to add a 'rug' representation of my data to a plot created with
densityplot(). While I can do this in the simple case, I can't do it properly
when I include the "groups" argument. I have an example below. I am running a
reasonably new version of R.
print(sessionInfo())
R version 2.12.0 Patched (2010-11-07 r53537)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_NZ.UTF-8 LC_NUMERIC=C LC_TIME=en_NZ.UTF-8
LC_COLLATE=en_NZ.UTF-8 [5] LC_MONETARY=C
LC_MESSAGES=en_NZ.UTF-8 LC_PAPER=en_NZ.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
LC_MEASUREMENT=en_NZ.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lattice_0.19-13
R code to show the problem:
## Setup - load package, set random seed & create fake dataset
library(lattice)
set.seed(1234)
d <- data.frame(Type=rep(LETTERS[1:4], times=250),
Category=rep(LETTERS[22:26], times=200),
Value=c(rnorm(500), rnorm(300, 0.5), rnorm(200, 1))
)
## Basic "densityplot" using 'points' to show the data
densityplot(~Value|Type, data=d)
## And I can plot a 'rug' for the simple density plot
densityplot(~Value|Type, data=d, plot.points='rug')
## Now add a "groups" selector to show sub-grouping of data by 'Category'
## Note: the data points are in color
densityplot(~Value|Type, group=Category, data=d)
## Finally, with the groups, and with a rug.
## Note: no color for the rug
densityplot(~Value|Type, group=Category, data=d, plot.points='rug')
So, I can draw a rug (which is an improvement over version 2.9.1 of R when I
got no rug), however, the color associated with the 'group' doesn't seem to
propagate through to the rug. Is there something I am doing wrong here or is
this a bug? Anyone have suggestions to work around this?
Regards,
Mark
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