On 15/07/2010 4:51 PM, Michael Friendly wrote:
In a paper I'm writing using Sweave, I make use of lattice graphics, but
don't want to explicitly show (or explain)
in the article text the print() wrapper I need in code chunks for the
graphs to appear.
I can solve this by including each chunk twice, with different options,
as in
<<ortho-xyplot1-code, keep.source=TRUE, eval=FALSE>>=
library(nlme)
library(lattice)
xyplot(distance ~ age|Sex, data=Orthodont, type='b', groups=Subject,
pch=15:25,
col=palette(), cex=1.3, main="Orthodont data")
@
<<ortho-xyplot1,fig=TRUE, include=FALSE, echo=FALSE, width=6, height=6>>=
library(nlme)
library(lattice)
print(xyplot(distance ~ age|Sex, data=Orthodont, type='b',
groups=Subject, pch=15:25,
col=palette(), cex=1.3, main="Orthodont data"))
@
but then, if I decide to change the plotting code, I have to make
changes in two places. Is there some
feature of Sweave or lattice I've missed that would simplify this?
Re-use of code chunks doesn't seem
to apply here.
If the lattice call is always last in the chunk, I believe this would
work as a replacement for the second chunk:
<<ortho-xyplot1,fig=TRUE, include=FALSE, echo=FALSE, width=6, height=6>>=
<<ortho-xyplot1-code>>
print(.Last.value)
@
and then you'll only have to edit the first one. But I haven't tried
this, so something might go wrong...
Duncan Murdoch
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