On Tue, 2009-09-15 at 17:16 +0100, Corrado wrote: > Dear R, > > the condition: > > identical(length(x),1) returns FALSE > > but > > print(length(x)) > > returns 1 and: > > is.vector(x) is TRUE. > is.integer(length(x)) is TRUE > length(x) ==1 is TRUE > > I am puzzled.
The key is noticing that 1 is a double: [note you don't give us your x so I'm making this up - This is what Duncan was going on about in an earlier thread, give us something we can just paste into R and it works] > x <- 2 > identical(length(x),1) [1] FALSE > class(1) [1] "numeric" > typeof(1) [1] "double" > typeof(length(x)) [1] "integer" and therein lies the reason for the difference. If you want to force 1 to be integer, the append and L, i.e.: > identical(length(x),1L) [1] TRUE Are you really looking for all.equal()? > isTRUE(all.equal(length(x), 1)) [1] TRUE HTH G > > Regards -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.
