Thanks a lot Baptiste & Dimitris, It's working!
Cheers, Umesh On Wed, Apr 29, 2009 at 2:06 PM, Dimitris Rizopoulos < d.rizopou...@erasmusmc.nl> wrote: > probably you want to use seq(), e.g., > > mat <- matrix(1:500, 100, 5) > > mat[seq(1, nrow(mat), 2), ] > mat[seq(1, nrow(mat), 3), ] > mat[seq(1, nrow(mat), 4), ] > > > I hope it helps. > > Best, > Dimitris > > > Umesh Srinivasan wrote: > >> Hi all, >> >> If I have a huge matrix/ dataframe and I want to create a new matrix/ >> dataframe with every second (or third, or fourth etc.) row of the original >> matrix, how can I do it? Any help much appreciated. >> >> Thanks, >> Umesh >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> 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. >> >> > -- > Dimitris Rizopoulos > Assistant Professor > Department of Biostatistics > Erasmus University Medical Center > > Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands > Tel: +31/(0)10/7043478 > Fax: +31/(0)10/7043014 > [[alternative HTML version deleted]] ______________________________________________ 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.
