(define (arg-max f a) (define (helper f a m v) (if (null? (car a)) v (if (> (f (car a)) m) (helper (f (car a)) (cdr a) (= m (f (car a))) (= v (car a))) (helper (f (car a)) (cdr a) m v)) ) ) (helper f a 0 (car a)) ) (define (square a) (* a a))

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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(define (arg-max f a)
(define (helper f a m v)
(if (null? (car a)) v

(if (> (f (car a)) m)
(helper (f (car a)) (cdr a) (= m (f (car a))) (= v (car a)))
(helper (f (car a)) (cdr a) m v))
)
)
(helper f a 0 (car a))
)

(define (square a) (* a a))
> (arg-max square '(3 2))
. . application: not a procedure;
expected a procedure that can be applied to arguments
given: 9
>

I want to create a helper function to return the most argument a, but I find this error when debugging, the error is located in inner if condition '(> (f (car a)) m)'. My parameter f would be a function and has one parameter from list a. How can I modify my code? Thanks! 

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