Hi Jim, I might be missing something but your command gives the error: Error in rowSums(mag) : 'x' must be an array of at least two dimensions
############################# data(attenu) attach(attenu) rowSums(mag) + rowSums(station) attenu$new<-rowSums(cbind(mag, station)) ############################# Thanks On Sat, Sep 26, 2009 at 4:30 PM, jim holtman <jholt...@gmail.com> wrote: > Probably more efficient if you remove the 'cbind' which would create a > combined matrix. Use the following: > > rowSums(mag) + rowSums(station) > > On Sat, Sep 26, 2009 at 11:16 AM, tzygmund mcfarlane > <tzygm...@googlemail.com> wrote: >> Hi, >> >> For very large matrices, is this the most efficient way to add two >> variables together? >> >> ############################# >> attach(attenu) >> new<-rowSums(cbind(mag, station)) >> ############################# >> >> Also, could I be directed to some resources for working with very >> large datasets? >> >> Thanks >> >> ______________________________________________ >> 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. >> > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem that you are trying to solve? > ______________________________________________ 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.