el
Lib.el : int -> 'a list -> 'a
Extracts a specified element from a list.
el i [x1,...,xn] returns xi. Note that the elements are numbered
starting from 1, not 0.
Failure
Fails with el if the integer argument is less than 1 or greater than
the length of the list.
Example
> el 3 [1,2,7,1];
val it = 7: int