Sweave: Variables in code chunk headers

Michael Hoffman <b3i4old02 <at> sneakemail.com> writes:

I would like to be able to do something like this:

   <<echo=F,fig=T,width=mywidth>>=
   ...
   @

with mywidth set in a previous code chunk. Is there a way to do this in 
Sweave?

Not in the <<>>, but you could set a hook for fig:

From Sweave docs:

If option "SweaveHooks" is defined as list(fig = foo), and foo is a function,
then it would be executed before the code in each figure chunk. This is
especially useful to set defaults for the graphical parameters in a series of
figure chunks.

Dieter