You might want to investigate the 'data.table' package.
On 07/04/2010 16:15, bo wrote:
Hi all, I have a huge dataset(5000k observations), which contains the daily sales for each company. If I want to find out the a company with unique company id number, which function I should use that is more efficient, match or "=="? For example, use<-dataset[!is.na(match(dataset$companyID, 12345)),] or use<-dataset[dataset$companyID==12345,] Thank you very much.
-- Patrick Burns pbu...@pburns.seanet.com http://www.burns-stat.com (home of 'Some hints for the R beginner' and 'The R Inferno') ______________________________________________ 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.
