[R] replacing elements of vector through elements of another vector
marcus.mund at uni-jena.de
Thu Jul 28 10:01:57 CEST 2011
Dear Marc and David,
thank you so much for casting off my blinkers - it works!
Am 27.07.2011 17:52, schrieb David Winsemius:
> 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!
>> 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.mund at uni-jena.de
>> Fingerprint: 6B15F90EA7752D9E327A055427F4F5DC255188C4
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> and provide commented, minimal, self-contained, reproducible code.
> David Winsemius, MD
> West Hartford, CT
Dipl.-Psych. Marcus Mund
Institute of Psychology
Department of Personality Psychology and Psychological Assessment
07743 Jena, Germany
Phone: +49 3641/9-45 960
Mail: marcus.mund at uni-jena.de
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