On Tue, 23 Dec 2003, 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)
> else{
> plot(1,1,type="n")
> text(1,1,"data not available.\n")
> }
> @
>
I think your problem is with the `else'. The `if' part of the statement
is syntactically complete, so the parser isn't expecting an `else'. You
need something like
if (exists("x")){
plot(x,x)
} else {
plot(1,1,type="n")
}
-thomas
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