Inline. -- Bert Bert Gunter
"Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Thu, Aug 20, 2015 at 10:47 PM, Peter Langfelder <peter.langfel...@gmail.com> wrote: > On Thu, Aug 20, 2015 at 10:04 PM, Bert Gunter <bgunter.4...@gmail.com> wrote: > >>> I noticed you made two data-frames, ‘my4s' and ‘my4S'. The `my4S` was built >>> with `cbind` which would create a matrix (probably a character matrix) >>> rather than a data frame. >> >> False. There is a data.frame method for cbind that returns a data >> frame. Don't know the specifics here, though. >> > > True, but does not apply here, i.e., David is correct. cbind will > return a data frame if the first argument is a data frame. In the OP > case, the first argument was a vector and hence cbind gives a matrix, False again. class(cbind(a=1:5,b=data.frame(a=letters[1:5],b=3:7))) [1] "data.frame" ##First argument a vector, but data frame is returned. Please consult ?cbind -- especially the data frame section -- for details. Again, I don't know the specifics here, and you and David may still well be right for what the OP did. I am only trying to correct what appear to me to be incorrect statements about the data.frame method of cbind (or rbind). Apologies if I have misinterpreted. Cheers, Bert > of mode "character" if any of the inputs were character. Here's a > short demo: > >> a = data.frame(a1 = 1:10) > # First argument a data frame, so the results is also a data frame : >> class(cbind(a, b = 11:20)) > [1] "data.frame" > # First argument is a vector, so the result is a matrix: >> class(cbind(a$a1, b = 11:20)) > [1] "matrix" >> mode(cbind(a$a1, b = 11:20)) > [1] "numeric" >> mode(cbind(a$a1, b = letters[11:20])) > [1] "character" > > Peter ______________________________________________ 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.
