Check data.table ... It benefits a lot from indexing data in data frames On Thu, May 19, 2011 at 7:41 PM, xiagao1982 <xiagao1...@gmail.com> wrote: > Hi all, > > I wonder if I can create indexes for columns in a data frame to speed up data > selection by matching column values, just like indexes for large tables in a > relational database? Thank you! > > > > > xiagao1982 > 2011-05-19 > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. >
______________________________________________ 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.
