Table error.

> lst
     [,1] [,2] [,3]
[1,] "3"  "2"  "1" 
> table(lst, lst)
Error in sort.list(y) : 
  'x' must be atomic for 'sort.list'
Have you called 'sort' on a list?
> traceback()
4: stop("'x' must be atomic for 'sort.list'\nHave you called 'sort' on a list?")
3: sort.list(y)
2: factor(a, exclude = exclude)
1: table(lst, lst)