Which version of R? Please try 2.4.0 alpha, as it has a different and more efficient algorithm for the case of 1-1 matches.
On Wed, 6 Sep 2006, Adam D. I. Kramer wrote: > Hello, > > I am trying to merge two very large data sets, via > > pubbounds.prof <- > merge(x=pubbounds,y=prof,by.x="user",by.y="userid",all=TRUE,sort=FALSE) > > which gives me an error of > > Error: cannot allocate vector of size 2962 Kb > > I am reasonably sure that this is correct syntax. > > The trouble is that pubbounds and prof are large; they are data frames which > take up 70M and 11M respectively when saved as .Rdata files. > > I understand from various archive searches that "merge can't handle that," > because merge takes n^2 memory, which I do not have. Not really true (it has been changed since those days). Of course, if you have multiple matches it must do so. > My question is whether there is an alternative to merge which would carry > out the process in a slower, iterative manner...or if I should just bite the > bullet, write.table, and use a perl script to do the job. > > Thankful as always, > Adam D. I. Kramer -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch 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.
