Yes! Thanks. It was just the "NA" value instead of the "as.null" that does
the trick. Correct code for the original piecewise I stated (for those who
might be looking later) is:
f <- function(x){
ifelse((-1 < x & x < 1),x^2,ifelse((2<x&x<3),1,NA))
}
plot(f,xlim=c(-1,3))
-Chad Mills
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