Dear Marc and David, thank you so much for casting off my blinkers - it works!
Marcus 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! >> >> 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 >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > David Winsemius, MD > West Hartford, CT -- Dipl.-Psych. Marcus Mund Friedrich-Schiller-University Jena Institute of Psychology Department of Personality Psychology and Psychological Assessment Humboldtstraße 11 07743 Jena, Germany Phone: +49 3641/9-45 960 Mail: marcus.m...@uni-jena.de Fingerprint: 6B15F90EA7752D9E327A055427F4F5DC255188C4 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.