Re: [R] Dataframe subset - why doesn't this work?
Thank you Jorge & Michael. I was being stupid - its the only explanation! The line I had been executing was mtcars[rownames=="Valiant"] # missing rownames argument but the line I quoted in my post was mtcars[rownames(mtcars) != "Valiant",] # How could I write the correct line in the mailing list and not where it matters i.e in R? Thank you. [[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.
Re: [R] Dataframe subset - why doesn't this work?
Hi Ajay, Like Jorge, I can't seem to reproduce the behavior you are worried about. mtcars[rownames(mtcars) != "Valiant",] returns a 31x11 data.frame as expected. When you say it "fails," what error message / result are you seeing? Michael On Fri, Feb 17, 2012 at 3:27 AM, Jorge I Velez wrote: > Hi Ajay, > > In the first case, you need "==" instead of "=" : > > R> mtcars[ rownames(mtcars) == "Valiant", ] > mpg cyl disp hp drat wt qsec vs am gear carb > Valiant 18.1 6 225 105 2.76 3.46 20.22 1 0 3 1 > > For the second case, > > R> mtcars[rownames(mtcars) != "Valiant",] > > will do it. > > See also ?subset. > > HTH, > Jorge.- > > > On Fri, Feb 17, 2012 at 3:02 AM, Ajay Askoolum <> wrote: > >> data(mtcars) >> >> mtcars[rownames(mtcars)!="Valiant",] # fails >> >> mtcars[list(rownames(mtcars))!="Valiant",] # runs but I am not getting the >> expected result >> >> With the latter statement, I expected all rows except the one where the >> name is "Valiant". >> >> I must have got something simple wrong; what is it? >> >> Thanks. >> >> [[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. >> > > [[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.
Re: [R] Dataframe subset - why doesn't this work?
Hi Ajay, In the first case, you need "==" instead of "=" : R> mtcars[ rownames(mtcars) == "Valiant", ] mpg cyl disp hp drat wt qsec vs am gear carb Valiant 18.1 6 225 105 2.76 3.46 20.22 1 031 For the second case, R> mtcars[rownames(mtcars) != "Valiant",] will do it. See also ?subset. HTH, Jorge.- On Fri, Feb 17, 2012 at 3:02 AM, Ajay Askoolum <> wrote: > data(mtcars) > > mtcars[rownames(mtcars)!="Valiant",] # fails > > mtcars[list(rownames(mtcars))!="Valiant",] # runs but I am not getting the > expected result > > With the latter statement, I expected all rows except the one where the > name is "Valiant". > > I must have got something simple wrong; what is it? > > Thanks. > >[[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. > [[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] Dataframe subset - why doesn't this work?
data(mtcars) mtcars[rownames(mtcars)!="Valiant",] # fails mtcars[list(rownames(mtcars))!="Valiant",] # runs but I am not getting the expected result With the latter statement, I expected all rows except the one where the name is "Valiant". I must have got something simple wrong; what is it? Thanks. [[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.
