Tanks for all your answers and for taking the time to help me better understand my mistake. I will take your advice and do some reading! Best, P.
Le mercredi 21 septembre 2016, William Dunlap <wdun...@tibco.com> a écrit : > The OP cannot be entirely blamed for thinking that x[,-"ColName"] > would omit x's "ColName" from the result. Base R and many packages > have commonly used functions that do context-sensitive (aka 'nonstandard') > evaluation. > > E.g. subset() evaluates each argument in a different way: > > subset(data.frame(ColA=1:3,ColB=-(11:13)), -ColB>11, -ColA) > ColB > 2 -12 > 3 -13 > > > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > On Wed, Sep 21, 2016 at 7:45 AM, Bert Gunter <bgunter.4...@gmail.com > <javascript:_e(%7B%7D,'cvml','bgunter.4...@gmail.com');>> wrote: > >> No, Rui, your example misses the point. Your initial sentence hits it. >> >> The OP needs to carefully read >> ?"[" >> and/or spend some time with a suitable R tutorial to learn proper >> syntax for subscripting. Asking foolish questions in lieu of doing her >> homework seems wrongheaded to me. Others may disagree, of course. >> >> Cheers, >> Bert >> >> >> >> >> Cheers, >> Bert >> Bert Gunter >> >> "The trouble with having an open mind is that people keep coming along >> and sticking things into it." >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) >> >> >> On Wed, Sep 21, 2016 at 1:26 AM, <ruipbarra...@sapo.pt >> <javascript:_e(%7B%7D,'cvml','ruipbarra...@sapo.pt');>> wrote: >> > Hello, >> > >> > The error message means exactly what it says. The operator '-' is >> > unary and cannot be followed by a non-numeric atomic object (a vector). >> > Try for instance >> > >> > x <- list(a=1:10, b=rnorm(5)) >> > -x >> > >> > Rui Barradas >> > >> > >> > Citando Pauline Laïlle <pauline.lai...@gmail.com >> <javascript:_e(%7B%7D,'cvml','pauline.lai...@gmail.com');>>: >> > >> >> Works like a charm, thanks! Still don't know what that error message >> >> means though. Any idea? >> >> >> >> 2016-09-20 20:13 GMT+02:00 <ruipbarra...@sapo.pt >> <javascript:_e(%7B%7D,'cvml','ruipbarra...@sapo.pt');>>: >> >>> Sorry, I've made a stupid mistake. >> >>> It's obviously the other way around. >> >>> >> >>> ix <- which(rownames(data) %in% c("601", "604")) >> >>> clean <- data[-ix, ] >> >>> >> >>> Rui Barradas >> >>> >> >>> Citando ruipbarra...@sapo.pt >> <javascript:_e(%7B%7D,'cvml','ruipbarra...@sapo.pt');>: >> >>>> Hello, >> >>>> >> >>>> Try something like the following. >> >>>> >> >>>> ix <- which(c("601", "604") %in% rownames(data)) >> >>>> clean <- data[-ix, ] >> >>>> >> >>>> Hope this helps, >> >>>> >> >>>> Rui Barradas >> >>>> >> >>>> Citando Pauline Laïlle <pauline.lai...@gmail.com >> <javascript:_e(%7B%7D,'cvml','pauline.lai...@gmail.com');>>: >> >>>> >> >>>>> Dear all, >> >>>>> >> >>>>> I built a dataframe with read.csv2(). Initially, row names are >> integers >> >>>>> (order of answers to a survey). They are listed in the csv's first >> column. >> >>>>> The import works well and my dataframe looks like I wanted it to >> look. >> >>>>> >> >>>>> Row names go as follows : >> >>>>> [1] "6" "29" "31" "32" "52" "55" "63" "71" "72" "80" >> "88" "89" >> >>>>> "91" "93" "105" "110" "111" "117" "119" "120" >> >>>>> [21] "122" "127" "128" "133" "137" "140" "163" "165" "167" "169" >> "177" >> >>>>> "178" "179" "184" "186" "192" "193" "200" "201" "228" >> >>>>> etc. >> >>>>> >> >>>>> I would like to drop rows "601" & "604" to clean the dataframe. >> >>>>> >> >>>>> While data["601",] shows me the first row i'd like to drop, >> data[-"601",] >> >>>>> returns the following : >> >>>>> Error in -"601" : invalid argument to unary operator >> >>>>> >> >>>>> idem with data[c("601","604"),] and data[-c("601","604"),] >> >>>>> >> >>>>> It is the first time that I run into this specific error. After >> reading a >> >>>>> bit about it I still don't understand what it means and how to fix >> it. >> >>>>> >> >>>>> Thanks for reading! >> >>>>> Best, >> >>>>> Pauline. >> >>>>> >> >>>>> [[alternative HTML version deleted]] >> >>>>> >> >>>>> ______________________________________________ >> >>>>> R-help@r-project.org >> <javascript:_e(%7B%7D,'cvml','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 >> <javascript:_e(%7B%7D,'cvml','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. >> >>> >> >>> >> > >> > >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > R-help@r-project.org >> <javascript:_e(%7B%7D,'cvml','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/posti >> ng-guide.html >> > and provide commented, minimal, self-contained, reproducible code. >> >> ______________________________________________ >> R-help@r-project.org >> <javascript:_e(%7B%7D,'cvml','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/posti >> ng-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > > [[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.