It seems to me that you are using polygon in a wrong way.
What you probably need could be something like:
polygon(c(rev(t$z), t$z),
c(rep(0, nrow(t)), t$ht), col=2, border=NA)
Stefano
-----Messaggio originale-----
Da: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] conto di LL
Inviato: sabato 26 maggio 2007 12.34
A: r-help@stat.math.ethz.ch
Oggetto: [R] polygon error?
Hi.. I'm not sure why polygon returns an area above the standard normal curve.
z <- pretty(c(-3,3), 100)
ht <- dnorm(z)
data <- data.frame(z=z, ht=ht)
zc <- 1.645
plot(data, type="l")
lines(data)
t <- subset(data, z>zc)
polygon(t, col="red")
Thanks,
Lance
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