Yes. And there's also a possibility of keeping the vector as a one column data frame (using a drop=FALSE argument in indexing to avoid conversion to vectors perhaps) so that nrow() can be used. This has the disadvantage of the inefficiency of using a data frame when a vector will do, and the advantage of avoiding the test.
Cheers, Bert Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." H. Gilbert Welch On Fri, Feb 14, 2014 at 7:44 AM, Jorge I Velez <jorgeivanve...@gmail.com> wrote: > Hi Berry, > > What about using > > NROW(input) > > ? > > Best, > Jorge.- > > > On Sat, Feb 15, 2014 at 2:26 AM, Berry Boessenkool < > berryboessenk...@hotmail.com> wrote: > >> Hi, >> >> In my function, I want to allow input to be a vector or a data.frame. >> Certain operations need to be done if the length or nrows exceeds one, but >> since "nrow" doesn't work for vectors, I cannot simply use >> >> if( nrow(input)>1 | length(input)>1 ) ... >> >> So is there a more elegant way to do this then with the following code? >> >> if( if(is.vector(input)) length(input)>1 else nrow(input)>1 ) ... >> >> thanks ahead, >> Berry >> ______________________________________________ >> 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.