Hi, To compare row wise is merely to compare column wise using the transpose matrix:
t(B) < A or t(t(B)<A) if the result needs to be a matrix with dimensions equal to B. Cheers, Tsjerk On Sun, Oct 30, 2011 at 9:44 AM, Patrick Burns <pbu...@pburns.seanet.com> wrote: > Given that you want to compare > columns, you can just do: > > A > B > > If you wanted to compare rows, then > it is more troublesome. One approach > would be: > > rep(A, each=nrow(B)) > B > > > On 30/10/2011 03:51, Wendy wrote: >> >> Hi, >> >> I have a vector and a matrix. For example, >> >> A = [ >> 12 >> 3 >> 4]; >> >> B = [ >> 4 13 >> 10 2 >> 4 8]; >> >> I am comparing A to each column of B using A>B[,ii], so the expected >> result >> is >> >> C = [ >> 1 0 >> 0 1 >> 0 0]; >> >> I am looking for a way to do this quickly instead of going through the for >> loop, but haven't had any luck yet? Any advice is appreciated. >> >> Thank you very much. >> >> Wendy >> >> >> >> >> >> >> -- >> View this message in context: >> http://r.789695.n4.nabble.com/element-by-element-comparison-tp3952301p3952301.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> 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. >> > > -- > Patrick Burns > pbu...@pburns.seanet.com > twitter: @portfolioprobe > http://www.portfolioprobe.com/blog > http://www.burns-stat.com > (home of 'Some hints for the R beginner' > and 'The R Inferno') > > ______________________________________________ > 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. > -- Tsjerk A. Wassenaar, Ph.D. post-doctoral researcher Molecular Dynamics Group * Groningen Institute for Biomolecular Research and Biotechnology * Zernike Institute for Advanced Materials University of Groningen The Netherlands ______________________________________________ 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.
