'c' does not have a method for factors. If you were
to try implementing one, you would probably quickly
figure out why not.
You want to call 'call' factor on the result of the call
to 'c'.
Patrick Burns
[EMAIL PROTECTED]
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")
Johannes Huesing wrote:
I have found that factor vectors are shy beasts.
Consider:
empty <- factor(levels=c("eins", "zwei"))
value <- factor("eins", levels=c("eins", "zwei"))
c(empty, value)
[1] 1
empty[1] <- value
empty
[1] eins
Levels: eins zwei
I could not exactly predict this behaviour, but ?c says:
The output type is determined from the highest type of the
components in the hierarchy NULL < raw < logical < integer < real
< complex < character < list < expression.
As factor is a class (of the whole vector) and not a type (of a single
element), c does not seem to preserve the object information, i.e. there
does not seem to be a c.factor, correct?
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