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")
}
@
and I get this error:
Error: chunk 6 Error in parse(file, n, text, prompt) : parse error
any help is appreciated.
Whenever you get an error message, copy and paste it into an R session (interactive) and see what happens. At least then you'll know where the problem is, and whether it's a Sweave problem or a problem with your R syntax (in this case, it's the second option. sorry).
This problem is almost, but not quite, a FAQ.
The problem is that the "if(...)" is syntactically complete after the first plot() command. The "else {" appears out of nowhere, as far as the R interpreter is concerned, and this makes no sense.
The fixes:
1) Always do this:
if(something) {
do something
} else {
do something else
}Note exactly (!) where the curly braces are, relative to the "else".
2) wrap the whole thing in curly braces.
{
if(something)
do somthing
else {
do something else
}
}Cheers
Jason
-- Indigo Industrial Controls Ltd. http://www.indigoindustrial.co.nz 64-21-343-545 [EMAIL PROTECTED]
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