Hmm, Well the error message is clear, perhaps in the docs: x a array, matrix, list or data.frame
I realize that this is minor, but is the warning necessary? f is a function not an NA, so FALSE, as would anything else that is not an NA. Though this may just be bad programming practice on my part, I have a member of an object that can be an integer, a function returning an integer or NA, perhaps it would be better to specify it as an integer, a function or NULL. Nicholas On Wed, 30 Sep 2009 14:41 -0400, "Duncan Murdoch" <murd...@stats.uwo.ca> wrote: > On 9/30/2009 2:29 PM, Nicholas Lewin-Koh wrote: > > Hi > > the following example I think demonstrates the inconsistency > >> f<-function(x) x > >> length(f) > > [1] 1 > >> is.na(f) > > [1] FALSE > > Warning message: > > In is.na(f) : is.na() applied to non-(list or vector) of type 'closure' > > As the error message says, closures aren't vectors. However, they do > have a length. > > > The documentation states: > > Arguments > > x an R object to be tested. > > value a suitable index vector for use with x. > > > > And nowhere in the details was it implied (to me anyway) that x could > > not be a function > > or anything else in R for that matter. Did I miss something? > > This might be an omission from the docs, but it did say pretty clearly > in the warning message that x needs to be a vector. So it's not a bug. > > The source for the docs is in > > https://svn.r-project.org/R/trunk/src/library/base/man/NA.rd > > If you can think of a way to make it clearer, and you think this is the > sort of error someone would not understand given the warning message, > please submit a patch. > > Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
