I'm having trouble using lattice and Sweave together.
An example of the trouble is the chunk
<<fig=true, eps=false>>=
library(nlme)
data(Orthodont)
plot(Orthodont)
@
This gives a warning
Warning message:
No Active Device, using default values in: trellis.par.get("add.text")
and creates a pdf file with no pages.
I think this is related to the fact that a figure chunk is evaluated
twice, once with no device open. Possibly related anomalies include the
fact that you end up with a theme set for the null device:
> names(lattice.theme)
[1] "null device" "postscript" "pdf"
which doesn't look right.
The chunk
<<>>=
library(lattice)
data(airquality)
windspeed<-equal.count(airquality$Wind, 4)
temperature<-equal.count(airquality$Temp, 4)
print(xyplot(Ozone~Solar.R|windspeed*temperature, data=airquality,
col="darkred"))
@
works fine, so I think the problem is related to using trellis.par.get
before setting a trellis device.
-thomas
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