[R] How to deal with character(0)?

[Gang Chen]

Thanks a lot for all who've provided suggestions!

Gang

On Nov 15, 2007, at 5:09 PM, Duncan Murdoch wrote:

> On 11/15/2007 4:54 PM, Gang Chen wrote:
>> I want to identify whether a variable is character(0), but get  
>> lost.  For example, if I have
>>  > dd<-character(0)
>> the following doesn't seem to serve as a good identifier:
>>  > dd==character(0)
>> logical(0)
>> So how to detect character(0)?
>
> (length(dd) == 0) && (typeof(dd) == "character")
>
> or if you really want to be specific (and rule out things that just  
> act like character(0) in most respects)
>
> identical(dd, character(0))
>
> Duncan Murdoch