(define v (make-vector 17)) ; Find out how many locations (vector-length v) ⇒ 17 ; Store a 7 into location 13 (vector-set! v 13 7) ; Retrieve what's in location 13 (vector-ref v 13) ⇒ 7 ; Put a 3 into the first location (vector-set! v 0 3) ; See that location 13 still intact (vector-ref v 13) ⇒ 7 ; Now clobber it (vector-set! v 13 0) ; See that location 13 did change (vector-ref v 13) ⇒ 0