Jim, Both my emails contained reproducible code (the first one wasn't completely reproducible - it required one to know that "attenu" is a base R dataset).
Anyway, thanks for your help. On Sat, Sep 26, 2009 at 8:11 PM, jim holtman <jholt...@gmail.com> wrote: > I assumed (since you did not provide reproducible code) that 'mag' was > a matrix. If 'station' is a matrix, then > > mag + rowSums(station) > > will work. If that does not work, then you need to tell us what your > data objects are. > > On Sat, Sep 26, 2009 at 11:39 AM, tzygmund mcfarlane > <tzygm...@googlemail.com> wrote: >> 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? >>> >> > > > > -- > 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.