Dan Davison wrote: > > > > Jagat.K.Sheth wrote: >> >> How about which(colSums(t-v) == 0) ? >> > > But what about v=c(2,1,3)? It needs to be something like > > which(colSums((t - v)^2)) == 0 > or > which(colSums(abs(t - v))) == 0 > Sorry, apparently I tried to write a line of R code without using emacs. Bad idea. I meant which(colSums((t - v)^2) == 0) Dan
Dan Davison wrote: > > > Dan > > > Jagat.K.Sheth wrote: >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> On Behalf Of Salas, Andria Kay >> Sent: Monday, November 24, 2008 10:04 AM >> To: r-help@r-project.org >> Subject: [R] matching matrix columns to a vector >> >> I need help with (hopefully) just one more thing. I have been fussing >> with this for quite some time and have decided just to give up and ask! >> I want to match a column in a matrix to a vector. I found a "which" >> command that I thought would be helpful as it does the following: >> >>> g=c(1,5,3,2,7) >>> which(g==5) >> [1] 2 >> >> As the above gave which placement in the g vector corresponded to 5 (the >> second place), I need this command to give me which column in a matrix >> matches to a vector. >> >> This is just a toy example of what I am trying to do: >>> t=matrix(1:12,3,4) >>>v=c(1,2,3) >>>which(t[,j]==v) >> >> This does not work, and with my "real" matrices and vectors, I was >> getting outputs that did not make sense. These examples are more to >> give an idea of what I am aiming to accomplish. >> >> Thank you for all the help!! >> ______________________________________________ >> 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. >> >> > > -- View this message in context: http://www.nabble.com/matching-matrix-columns-to-a-vector-tp20664376p20668878.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.
