Hi On 6 Apr 2005 at 11:34, H J Gerber wrote:
> Hi All, > > I want to select a level of a factor variable from a dataset. I have > the folowing data: dataset: use factor: month (use$month, > levels=February, July) > use[1:5,] > month registration use department size > 1 February KKG151GP Y Safety 1.6 > To select February I tried: > > use[use$month=="February"] > Error in "[.data.frame"(use, use$month == "February") : > undefined columns selected Dimensions! use[use$month=="February",] shall show all columns where use$month = February Cheers Petr > > use[use$month == levels(use$month)[1]] > Error in "[.data.frame"(use, use$month == levels(use$month)[1]) : > undefined columns selected > It seems if a logical variable is created, and the subsetting on a > factor variable won't work directly.(It works directly for numeric > variables) Can anyone help please. > > Regards > Hennie Gerber > > > Hennie Gerber > Statistician > UNISA - Research Support > + 27 12 429 3188 > Waarskuwing! > Die sienings uitgespreek is my eie en nie noodwendig my werkgewer sin > nie Warning! All views expressed are my own and not necessarily that > of my employer. > > > > > > > ---------------------------------------------------------------------- > ----- This message (and attachments) is subject to restrictions and a > disclaimer. Please refer to http://www.unisa.ac.za/disclaimer for full > details. > ---------------------------------------------------------------------- > ----- <<<<gwavasig>>>> <<<< gwavasig >>>> > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html Petr Pikal [EMAIL PROTECTED] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
