Duncan Murdoch wrote:
> I put together a clunky way to handle that for a presentation last week;
> it may be enough for you.
>
> I leave the Sweave options at their defaults, but I have code chunks
> that affect the appearance, and I run those without echoing to switch
> between a couple of formats. For example, I have some pages that
> display one figure, and others that display two.
That is a decent way of doing what I am suggesting. Probably too
complicated to be worth it if I am just changing one variable.
> One other thing that would have helped with this approach would be a way
> to include another file: then I wouldn't have to repeat those
> definitions in every Rnw of the project.
Yet another candidate for (yet another) pre-processing step. :)
Of course, you could load the complicated bits in another file with
source(). You'd still have to redefine <<single>> and <<double>>
everywhere, but at least you would be able to change the option settings
easily. Like this:
<<echo=F>>
source("init.R")
@
<<single, echo=F, eval=F>>=
setup.single() # loaded from init.R
@
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