On 12/09/2010 11:41 AM, Michael Friendly wrote:
Just a follow-up on this thread, now with R 2.11.1. I was happy back
then to use Deepayan's solution for this, under earlier R versions; but
it now gives an error and the Sweave-generated .tex file no longer compiles.
<<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>>=
plot(trellis.last.object())
@
Now, I get the following from Sweave:
Error: chunk 46 (label=ortho-xyplot1)
Error in !lattice.getStatus("current.plot.saved", prefix = prefix) :
invalid argument type
Did something in lattice change so that plot(trellis.last.object()) no
longer works or needs to be specified differently?
I don't know if something in lattice has changed, but that doesn't look
as though it should work: the code to do the plot was never evaluated.
I think you would need eval=TRUE in the first chunk, or
<<ortho-xyplot1-code>>
ahead of the plot command in the second.
Duncan Murdoch
-Michael
On 7/16/2010 1:14 AM, Deepayan Sarkar wrote:
On Thu, Jul 15, 2010 at 1:51 PM, Michael Friendly<frien...@yorku.ca> 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.
I usually use this variant of Duncan's suggestion:
<<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>>=
plot(trellis.last.object())
@
-Deepayan
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