It would be helpful if - you give us some sample data: dput( head( myData ) )
- tell us what kind of function you want to apply, or how the result looks like that you want to achieve - show us what you have done so far, and where you are stuck On Saturday 17 August 2013 19:33:08 Dylan Doyle wrote: > > Hello R users, > > > I have recently begun a project to analyze a large data set of approximately > 1.5 million rows it also has 9 columns. My objective consists of locating > particular subsets within this data ie. take all rows with the same column 9 > and perform a function on that subset. It was suggested to me that i use the > ddply() function from the Pylr package. Any advice would be greatly > appreciated > > > Thanks much, > > Dylan > > > [[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.
