Your data frame contains no column named "Name" . Maybe what you want is
rownames(all.states)[all.state$Frost>150] However, what you clearly need to do is stop posting until you have done your homework by spending some time with one of the many good R tutorials that are out there (possibly Intro to R, which ships with R, though it's getting a bit dated now). This appears to be a very basic question. If you are going through a tutorial and got stuck here, then note that row names are an attribute of the data frame, not a column name of one of its columns. See ?rownames and the links therein for more info. Cheers, Bert Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll On Sun, Mar 22, 2015 at 7:39 AM, Yves S. Garret <yoursurrogate...@gmail.com> wrote: > Hi, I'm just learning my way around R. I got a bunch of states and would > like to access to get all of the ones where it's cold. But when I do the > following, I will get the following error: > >> all.states <- as.data.frame(state.x77) >> cold.states <- all.states[all.states$Frost > 150, c("Name", "Frost")] > Error in `[.data.frame`(all.states, all.states$Frost > 150, c("Name", : > undefined columns selected > > I don't get it. When I look at all.states, this is what I see: > >> str(all.states) > 'data.frame': 50 obs. of 8 variables: > $ Population: num 3615 365 2212 2110 21198 ... > $ Income : num 3624 6315 4530 3378 5114 ... > $ Illiteracy: num 2.1 1.5 1.8 1.9 1.1 0.7 1.1 0.9 1.3 2 ... > $ Life Exp : num 69 69.3 70.5 70.7 71.7 ... > $ Murder : num 15.1 11.3 7.8 10.1 10.3 6.8 3.1 6.2 10.7 13.9 ... > $ HS Grad : num 41.3 66.7 58.1 39.9 62.6 63.9 56 54.6 52.6 40.6 ... > $ Frost : num 20 152 15 65 20 166 139 103 11 60 ... > $ Area : num 50708 566432 113417 51945 156361 ... > > What am I messing up? > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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 -- To UNSUBSCRIBE and more, see 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.