Perhaps something (untested) like sapply(split(x, rownames(x)), colSums)
Next time it's suggested you use dput() to send your data. Michael On Tue, Feb 14, 2012 at 7:08 AM, Soheila Khodakarim <lkhodaka...@gmail.com> wrote: > I have this matrix in R, > > > s1 s2 s3 s4 > g1 1 0 0 0 > g1 0 1 0 0 > g1 0 0 1 0 > g2 1 0 0 0 > g2 0 1 0 0 > g3 1 0 0 0 > g4 0 0 1 0 > g4 1 0 0 0 > g4 0 1 0 0 > g4 0 0 0 1 > > > I want to split this matrix based on its rows then sum based on columns, > finally I want to make this matrix: > > s1 s2 s3 s4 > g1 1 1 1 0 > g2 1 1 0 0 > g3 1 0 0 0 > g4 1 1 1 1 > > I will appreciate if you guide me. > > Regards, > Soheila > > [[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. ______________________________________________ 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.
