Mark, I really apprecaite your response and continue to be amazed by the responsiveness and support on the R forums.
And, well actually, I would like to get the "row number"(s) and then delete or not via the row number. Again, I really appreciate the response... --- On Tue, 5/26/09, Mark Wardle <m...@wardle.org> wrote: > From: Mark Wardle <m...@wardle.org> > Subject: Re: [R] Problem accessing "row number" from subset on a dataframe > To: "Jason Rupert" <jasonkrup...@yahoo.com> > Cc: R-help@r-project.org > Date: Tuesday, May 26, 2009, 3:18 PM > Hi. I may be missing what you're > trying to achieve, but... > > what about > > subset(airquality, airquality$Month!=6) > > instead? > > You can do arbitrarily complex queries if you wish, > combining terms logically. > > You don't have to use the subset function. You may find it > helpful to > see what the following result in: > > airquality$Month==6 > airquality[airquality$Month==6, ] > airquality[airquality$Month==6, ] > > There are ways of getting the row numbers, but I suspect > you don't > actually need to do that, do you? > > Best wishes, > > Mark > > 2009/5/26 Jason Rupert <jasonkrup...@yahoo.com>: > > > > > > I would like to use the "row number" information > returned from performing a subset command on a dataframe. > > > > For example, I would like to automatically delete some > rows from a dataframe if they match a criteria. Here is my > example below. > > > > data(airquality) > > names(airquality) > > subset(airquality, airquality$Month == 6) > > > > Now how do I delete the row numbers returned > automatically? > > > > I know I can type > > airquality_mod<-airquality[-c(32:60)] > > > > However, I would like to check the row information and > then use it to delete the stuff out of the dataframe. > > > > Thank again for any feedback and insights. > > > > ______________________________________________ > > 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. > > > > > > > > -- > Dr. Mark Wardle > Specialist registrar, Neurology > Cardiff, UK > ______________________________________________ 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.
