Give us also:
(define (contav vect)
(contav-aux vect 0 (vector-length vect) 0))
I've tried the following but for some reason is always giving error, can you give me a hand? Thank you!
(define (contav-aux vect indice tamanho total)
(cond ((null? vect) 0)
((symbol? (vector-ref vect 0))((contav-aux vect (+ indice 1) tamanho total)))
(else (contav-aux vect (+ 1 indice) tamanho (+ 1 total)))))