split() might help, but you should give a more complete explanation of your problem.
Bill Dunlap TIBCO Software wdunlap tibco.com On Mon, Apr 6, 2015 at 1:56 PM, Keshav Dhandhania <kshav...@gmail.com> wrote: > Hi, > > I know that one can find all occurrences of x in a vector v by doing > > which(x == v). > > However, if I need to do this again and again, where v is remaining the > same, then this is quite inefficient. In my particular case, I need to do > this millions of times, and length(v) = 100 million. > > Does anyone have suggestion on how to go about it? > I know of a package called fmatch that does the above for the match > function. But they don't handle multiple matches. > > Thanks > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
