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best way to do fibs in lisp

Name: Anonymous 2012-02-18 1:18

i see so many, but which is best?

Name: Anonymous 2012-02-18 1:37

If it's Lisp, it's not the BEST

Name: Anonymous 2012-02-18 2:25

The best one uses continuations, delayed evaluation, a DSL made of macros, a Y combinator derived from the SKI combinators, and Church numerals just to show off the POWER OF LISP.

Name: Anonymous 2012-02-18 3:09

Lisp is shit.

Name: Anonymous 2012-02-18 20:14

The method that also does factorials

Name: Anonymous 2012-02-18 20:35

the only ``fibs'' are:
1. lisp is not shit
2. my other car is not a cdr

Name: Anonymous 2012-02-19 8:44

(define (fib n)

  (define (fib-iter a b p q count)

    (cond ((zero? count) b)

          ((even? count)

           (fib-iter a

                     b

                     (+ (* p p) (* q q))

                     (+ (* 2 p q) (* q q))

                     (/ count 2)))

          (else (fib-iter (+ (* b q) (* a q) (* a p))

                          (+ (* b p) (* a q))

                          p

                          q

                          (- count 1)))))

  (fib-iter 1 0 0 1 n))

O(log n)

best way to do fibs in lisp

1 Name: Anonymous 2012-02-18 1:18

2 Name: Anonymous 2012-02-18 1:37

3 Name: Anonymous 2012-02-18 2:25

4 Name: Anonymous 2012-02-18 3:09

5 Name: Anonymous 2012-02-18 20:14

6 Name: Anonymous 2012-02-18 20:35