[R] Sweave question

[Deepayan Sarkar]

On Tuesday 23 December 2003 09:44, Rafael A. Irizarry wrote:
> Using Sweave in the tools library (R version 1.8.0: sorry i havent
> upgraded), it seems i cant use if statements in R chunks that make graphs.
> i have this:
>
> <<fig=TRUE,echo=F>>=
> par(mfrow=c(1,1))
> if(exists("x"))
> 	plot(x,x)

This is a problem even outside of Sweave. The last line above syntactically 
completes the if statement. You need to replace it by something like 

if(exists("x")) {
 	plot(x,x)
  } else {
...

> else{
>   plot(1,1,type="n")
>   text(1,1,"data not available.\n")
> }
> @
>
> and I get this error:
>
> Error:  chunk 6
> Error in parse(file, n, text, prompt) : parse error
>
> any help is appreciated.
>
> thanks and apologies if this not a problem in R 1.8.1
> rafael
>
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