Clojure de Fibonacci number

なんとなく試してみた。

 ~/workspace/sketch
% time ./clojure.clj
3524578
./clojure.clj  2.44s user 0.11s system 98% cpu 2.588 total

 ~/workspace/sketch
% time ./python.py
3524578
./python.py  2.97s user 0.02s system 98% cpu 3.025 total

へー。 それだけなんだけど。

#!/usr/bin/env clj
(defn fib [n]
  (if (<= n 2) 
    1 
    (+ (fib (- n 1)) (fib (- n 2)))))

(println (fib 33))

#!/usr/bin/env python
# encoding: utf-8

from __future__ import print_function

def fib(n):
    if n <= 2:
        return 1
    return fib(n - 1) + fib(n - 2)

print(fib(33))

追記

(def fibs (lazy-cat [0 1] (map + fibs (rest fibs))))
(println (take 33 fibs))

clojureでフィボナッチ

ほへー。よくわかりませんが早い…。

% time ./clojure.clj
(0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711 28657 46368 75025 121
393 196418 317811 514229 832040 1346269 2178309)
./clojure.clj  1.02s user 0.11s system 94% cpu 1.200 total