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:
<<echo=FALSE>>=
needRun <- TRUE
@
...
<<thecode,eval=FALSE>>=
someSlowFunction()
@
<<echo=FALSE>>=
if (needRun) {
<<thecode>>
}
@
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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