On 17-Jan-09 02:57:13, Jörg Groß wrote: > Hi, > I have a problem with the R syntax. > It's perhaps pretty simple, but I don't understand it ... > > I can extract a column from a data.frame with the following code > for example ... > > b$row1[b$row1 == "male"] > > so I see all male-entries. > > But I cannot extract all lines of a data.frame depending on this > criterium; > > only.male <- b[b$row1 == "male"] > > With that, I get an "undefined columns selected" message. > > So how can I extract lines of a data.frame depending on a level > variable?
only.male <- b[b$row1 == "male",] should work. Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 17-Jan-09 Time: 09:48:43 ------------------------------ XFMail ------------------------------ ______________________________________________ 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.
