{"blog_url":"https://awacio.hatenadiary.org/","author_url":"https://blog.hatena.ne.jp/awacio/","width":"100%","published":"2010-02-10 19:53:00","author_name":"awacio","blog_title":"awacio.log","type":"rich","url":"https://awacio.hatenadiary.org/entry/20100210/1265799180","categories":["SICP","Scheme"],"height":"190","image_url":null,"provider_url":"https://hatena.blog","version":"1.0","title":"SICP \u554f\u984c 1.13 \uff08Fibonacci\u6570\u306e\u5e30\u7d0d\u7684\u8a3c\u660e\uff1f\uff09","provider_name":"Hatena Blog","description":"\u7df4\u7fd2\u554f\u984c 1.13\u306f\u3001\u666e\u901a\u306b\u6570\u5b66\u306e\u554f\u984c\u306a\u3093\u3058\u3083\u3002\u3002 \u3061\u306a\u307f\u306b\u547d\u984c\u306e\u524d\u534a\u306f\u3001\u3069\u3046\u8868\u73fe\u3059\u308c\u3070\u3088\u3044\u306e\u304b\u3055\u3063\u3071\u308a\u308f\u304b\u308a\u307e\u305b\u3093\uff01 \u306a\u306e\u3067\u3001\u30d2\u30f3\u30c8\u4ee5\u964d\u3092\u8a3c\u660e\u3057\u3088\u3046\u3002 \u3010\u554f\u984c\u3011 \u03c6 = (1 + \u221a5)) / 2\u3068\u3057\u3066\u3001Fib(n)\u304c (\u03c6^n) / \u221a5) \u306b\u6700\u3082\u8fd1\u3044\u6574\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u8a3c\u660e\u305b\u3088\u3002\u30d2\u30f3\u30c8\uff1a \u03c8 = (1 - \u221a5)) / 2\u3068\u3059\u308b\u3002\u5e30\u7d0d\u6cd5\u3068Fibonacci\u6570\u306e\u5b9a\u7fa9(1.2.2\u7bc0\u53c2\u7167\uff09\u3092\u7528\u3044\u3001 Fib(n) = (\u03c6^n - \u03c8^n) / 5^(1/2)\u3092\u8a3c\u660e\u305b\u3088\u3002 \u3010\u89e3\u7b54\u3011 \u03c6\u3068\u03c8\u306e\u7279\u6027\u3068\u3057\u3066\u3001\u6b21\u304c\u6210\u308a\u7acb\u3064\u3002 \u03c6^2 = \u03c6 + 1 \u03c8^2 = \u03c8 + 1\u307e\u305f\u3001\u521d\u671f\u6761\u4ef6\u3068\u3057\u3066\u3001n=0\u3001n=1\u2026","html":""}