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1999 Dec 01
1
odd result of length() with factor arguments with NA (PR#354)
The following looks odd to me, but it may well be that I'm doing
something I shouldn't:
x <- c(rep("a",5),NA,rep("b",7))
X <- as.factor(x)
length(X)
# [1] 13
length(X[X=="a"])
# [1] 6 I expected 5
length(X[X=="b"])
# [1] 8 I expected 7
length(X[is.na(X)])
# [1] 1 yes
length(X[X=="d"])
# [1]