[R] sweave options with variable

Duncan Murdoch murdoch.duncan at gmail.com
Sun Apr 17 14:30:37 CEST 2011

On 11-04-17 2:41 AM, Kai Ying wrote:
> hello:
>     Do any one know how to set sweave option by variable, for example I want
> set some of my selected code chunk with:
> <<eval=needRun>>= rather than<<eval=TRUE>>=, so  I can change the action
> only in the head by change the variable "needRun" one times.
> I have tried use "\Def" and "\newcommand", both do not work, so I suppose it
> is related with R/Sweave its self.
> thanks for any good suggestion.

You can't do that, but you can get a similar effect this way:

needRun <- TRUE



if (needRun) {

Or you could use cacheSweave or weaver for caching, which may do what 
you want, or write your own Sweave driver to do exactly what you want.

Duncan Murdoch

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