I found that if a numeric vector is used to set the line type in
segments(), then any NA values get plotted with a particular pattern,
rather than omitted as usually happens with NAs. Similarly,
plot(rnorm(5),type="l",lty=as.numeric(NA))
does plot a line, curiously enough not with the same pattern as
plot(1:7,2:8)
segments(1:5,2:6,4:8,3:7,lty=c(NA,1:4))
lty=NA (i.e. logical NA) gives an error.
Surely this is more a bug than a feature?
-p
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907