Using identical() in R with multiple vectors

Question

Suppose that I have five vectors:

A<-1:10
B<-1:10
C<-1:10
D<-1:10
E<-1:12

I could test two at a time using identical( ).

Answer 1

I would just pick one, say A, and do all pair-wise comparisons with it.

all(sapply(list(B, C, D, E), FUN = identical, A))
# [1]  FALSE

Remove the all() to see the not identical one(s)

sapply(list(B, C, D, E), FUN = identical, A)
# [1]  TRUE  TRUE  TRUE FALSE

identical ought to be transitive, so if A is identical to C and to D, then C should be identical to D.

(Thanks to @docendo discimus for simplified syntax.)