[R] identical(length(x), 1) returns FALSE, but print(length(x)) is 1, length(x)==1 is TRUE, and is.integer(lenght(x)) is TRUE????

[David Winsemius]

On Sep 15, 2009, at 1:04 PM, Corrado wrote:

> On Tuesday 15 September 2009 17:28:02 Gavin Simpson wrote:
>> [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]
>
> Dear Gavin,
>
> I do not understand what more information! Take any vector of length  
> 1, for
> example x<-1. Plus all the command that where in my previous  
> email ....
>
> What is the logic behind
>
> identical(length(x),1)

identical() tests for the two objects having the same class for one  
thing:

 > class(length(c(9))  )
[1] "integer"
 > class(1)
[1] "numeric"

 > class(1) != class( length( c(9) ) )
[1] TRUE

>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT