Thanks, I have the case that there is a NA in the list. This should not be a column. But na.omit(l) does not work for lists. How to remove NAs from a list?
l <- list(c(1,2,3),NA,c(1,2,3)) mat <- do.call(cbind, l) Best Markus Dimitris Rizopoulos schrieb: > you can use do.call(), e.g., > > do.call(cbind, l) > > > I hope it helps. > > Best, > Dimitris > > > ---- > Dimitris Rizopoulos > Ph.D. Student > Biostatistical Centre > School of Public Health > Catholic University of Leuven > > Address: Kapucijnenvoer 35, Leuven, Belgium > Tel: +32/(0)16/336899 > Fax: +32/(0)16/337015 > Web: http://med.kuleuven.be/biostat/ > http://www.student.kuleuven.be/~m0390867/dimitris.htm > > > Quoting Markus Schmidberger <[EMAIL PROTECTED]>: > >> Hello, >> >> I have a list of vectors (all the same length). How to convert the list >> to a matrix? Each vector should be a column. >> I tried this: >> >> l <- list(c(1,2,3),c(1,2,3),c(1,2,3)) >> mat <- matrix( unlist(l), nrow=length(l) ) >> >> But I think this is not very efficient. Is there a better solution? >> >> Thanks >> Markus >> >> -- >> Dipl.-Tech. Math. Markus Schmidberger >> >> Ludwig-Maximilians-Universität München >> IBE - Institut für medizinische Informationsverarbeitung, >> Biometrie und Epidemiologie >> Marchioninistr. 15, D-81377 Muenchen >> URL: http://ibe.web.med.uni-muenchen.de >> Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de >> >> ______________________________________________ >> 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. >> >> > > > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > -- Dipl.-Tech. Math. Markus Schmidberger Ludwig-Maximilians-Universität München IBE - Institut für medizinische Informationsverarbeitung, Biometrie und Epidemiologie Marchioninistr. 15, D-81377 Muenchen URL: http://ibe.web.med.uni-muenchen.de Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de Tel: +49 (089) 7095 - 4599 ______________________________________________ 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.
