[shameless plug]
Jean lobry <[EMAIL PROTECTED]> writes:
> <<TimeConsumingCodeChunk1,eval=F>>=
> x <- rnorm(100)
> ...
> @
>
> I have \Sexpr{ifelse(exists("x"), length(x), "Ooops, I forgot
> to evaluate TimeConsumingCodeChunk1")} elements in vector x.
For the case of TimeConsumingCodeChunks, another solution is the
weaver package that caches the results of such chunks. So you could
have:
<<TimeConsumingCodeChunk1, cache=TRUE>>=
x <- rnorm(100)
...
@
Then as long as the dependencies of the expressions in
TimeConsumingCodeChunk1 don't change, it won't be recomputed.
Best,
+ seth
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