On Jul 27, 2011, at 10:52 AM, Marcus Mund wrote:
Hello everybody,
I hope this question is not too silly but I'm almost going crazy about
that and could not find a solution.
I have two variables, say A and B and I would like to combine them
in C.
In particular I want a C-value of B when B is not NA and the A value
in
case that B is NA:
A B C
2 NA 2
3 4 4
NA 3 3
4 1 1
2 NA 2
1 4 4
NA NA NA
5 3 3
4 1 1
I tried something like:
C <- B #assigning variable B to variable C
C[is.na(B) & A >= 0] <- A #using value of A in case that B is na
Just use:
C[is.na(B) ] <- A[is.na(B) ]
# doesn't matter what A is. Or if it does, then use same logical vecot
index on both sides
You need to have is.na(B) on both sides to get the vector assignments
to match up. That is what the error message is telling you.
but this results in an error message about the unequal length of the
replacement and what has to be replaced...
I guess I am too deep in the problem to see the (probably) easy
solution, hence any hints and advices are appreciated.
Thank you very much!
Marcus
--
Dipl.-Psych. Marcus Mund
Friedrich-Schiller-University Jena
Institute for Psychology
Department of Personality Psychology and Psychological Assessment
Humboldtstraße 11/Raum 111
07743 Jena, Germany
Tel.: +49 3641/9-45 960
Mail: marcus.m...@uni-jena.de
Fingerprint: 6B15F90EA7752D9E327A055427F4F5DC255188C4
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