[R] Sweave: infelicities with lattice graphics
Duncan Murdoch
murdoch.duncan at gmail.com
Thu Jul 15 23:02:30 CEST 2010
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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