{"id":207,"date":"2010-03-07T15:43:30","date_gmt":"2010-03-07T06:43:30","guid":{"rendered":"http:\/\/www.typea.info\/blog\/index.php\/2010\/03\/07\/_3\/"},"modified":"2010-03-07T15:43:30","modified_gmt":"2010-03-07T06:43:30","slug":"_3","status":"publish","type":"post","link":"https:\/\/www.typea.info\/blog\/index.php\/2010\/03\/07\/_3\/","title":{"rendered":"\u4e00\u4eba\u8aad\u66f8\u4f1a \u300c\u8a08\u7b97\u6a5f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u69cb\u9020\u3068\u89e3\u91c8\u300d (3)"},"content":{"rendered":"

<\/a> <\/p>\n

\u4e00\u4eba\u8aad\u66f8\u4f1a \u300c\u8a08\u7b97\u6a5f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u69cb\u9020\u3068\u89e3\u91c8\u300d (2)<\/a><\/p>\n

1.1.7 Newton \u6cd5\u306b\u3088\u308b\u5e73\u65b9\u6839<\/h2>\n

Newton\u6cd5<\/a> \u306b\u3088\u308a\u5e73\u65b9\u6839\u3092\u6c42\u3081\u308b\u624b\u7d9a\u304d\u3092\u5b9f\u88c5\u3059\u308b\u3002<\/p>\n

\u554f\u984c\u30001.6<\/h3>\n

if\u306f\u7279\u6b8a\u5f62\u5f0f\u3067\u3042\u308b\u304c\u3001cond \u3092\u5229\u7528\u3057\u3066\u666e\u901a\u306e\u624b\u7d9a\u304d\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3001\u5e73\u65b9\u6839\u306e\u8a08\u7b97\u306b\u3053\u308c\u3092\u4f7f\u304a\u3046\u3068\u3059\u308b\u3068\u4f55\u304c\u8d77\u304d\u308b\u304b\u3002<\/p>\n

 <\/p>\n

\u4ee5\u4e0b\u3001\u7279\u6b8a\u5f62\u5f0f\u306e if \u3092 \u901a\u5e38\u306e\u624b\u7d9a\u304d\u3067\u3042\u308b\u3001new-if \u3092\u5b9a\u7fa9\u3057\u3001\u5e73\u65b9\u6839\u3092 Newton\u6cd5 \u3067\u6c42\u3081\u308b\u51e6\u7406\u3092\u66f8\u304d\u76f4\u3057\u305f\u3002<\/p>\n

(define (square x) (* x x))\r\n(define (sqrt-itr guess x)\r\n  (new-if (good-enugh? guess x)\r\n      guess\r\n      (sqrt-itr (improve guess x)\r\n                x)))\r\n(define (improve guess x)\r\n  (avarage guess(\/ x guess)))\r\n(define (avarage x y)\r\n  (\/ (+ x y) 2))\r\n(define (good-enugh? guess x)\r\n  (< (abs (- (square guess) x)) 0.001))\r\n(define (sqrt2 x)\r\n  (sqrt-itr 1.0 x))\r\n\r\n(define (new-if predicate then-clause else-clause)\r\n  (cond (predicate then-clause)\r\n        (else else-clause)))\r\n<\/pre>\n
\u5b9f\u969b\u306b\u52d5\u304b\u3057\u3066\u307f\u308b\u3068\u3001\u30b9\u30bf\u30c3\u30af\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3060\u308d\u3046\u3001Out Of Memory \u304c\u767a\u751f\u3057\u305f\u3002<\/p>\n
\u7279\u6b8a\u5f62\u5f0f if \u3092\u4f7f\u3063\u305f\u5834\u5408\u306b\u306f\u3001\u60f3\u5b9a\u901a\u308a\u306e\u52d5\u304d\u3092\u3057\u3066\u3044\u305f\u3002\u3071\u3063\u3068\u898b\u3001\u7b49\u4fa1\u306b\u601d\u3048\u308b\u304c\u3002<\/p>\n
\"sicp_q_1_6\"<\/a> <\/p>\n
\u3046\u30fc\u30fc\u3093 \u3002\u3002\u3002 \u306a\u305c\u3060\u308d\u3046 \u3002\u3002\u3002<\/p>\n
\u30fb\u30fb\u30fb<\/p>\n
\u7279\u6b8a\u5f62\u5f0f\u30fb\u30fb\u30fb define \u306f \u7279\u6b8a\u5f62\u5f0f\u3067\u3001\u4f5c\u7528\u306f\u884c\u308f\u306a\u3044\u3002\u3002\u3002 if \u3082\u7279\u6b8a\u5f62\u5f0f\u30fb\u30fb\u30fb<\/p>\n
\u901a\u5e38\u8a55\u4fa1\u306f\u3001\u90e8\u5206\u5f0f\u3092\u8a55\u4fa1\u3057\u3001\u4f5c\u7528(\u6f14\u7b97\u5b50\u3092\u9069\u7528)\u3055\u305b\u308b\u30fb\u30fb\u30fb<\/p>\n
\u304a\u304a\uff01\u305d\u3046\u304b\u3001\u7279\u6b8a\u5f62\u5f0f\u3067\u306f\u306a\u3044\u304b\u3089\u3001\u88ab\u6f14\u7b97\u5b50\u304c\u3059\u3079\u3066\u8a55\u4fa1\u3055\u308c\u3066\u3057\u307e\u3046\u304b\u3089\u304b\uff01<\/font><\/strong>\u3001sqrt-itr \u306e else \u7bc0 \u3067\u3001\u518d\u5e30\u3057\u3066\u3044\u308b\u306e\u304c\u3001\u7d42\u4e86\u6761\u4ef6\u306b\u5408\u81f4\u3057\u3066\u3082\u3001else\u7bc0 \u304c\u306a\u3093\u3068\u3001\u8a55\u4fa1\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3060\uff01<\/p>\n
if \u306f\u7279\u6b8a\u5f62\u5f0f\u3067\u3001\u6761\u4ef6\u306b\u5408\u81f4\u3057\u305f then \u307e\u305f\u306f\u3001 else \u306e\u3069\u3061\u3089\u304b\u3057\u304b\u8a55\u4fa1\u3057\u306a\u3044\u306e\u3060\u3002<\/p>\n
\u306a\u308b\u307b\u3069\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u4eba\u8aad\u66f8\u4f1a \u300c\u8a08\u7b97\u6a5f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u69cb\u9020\u3068\u89e3\u91c8\u300d (2) 1.1.7 Newton \u6cd5\u306b\u3088\u308b\u5e73\u65b9\u6839 Newton\u6cd5 \u306b\u3088\u308a\u5e73\u65b9\u6839\u3092\u6c42\u3081\u308b\u624b\u7d9a\u304d\u3092\u5b9f\u88c5\u3059\u308b\u3002 \u554f\u984c\u30001.6 if\u306f\u7279\u6b8a\u5f62\u5f0f\u3067\u3042\u308b\u304c\u3001cond \u3092\u5229\u7528\u3057\u3066\u666e\u901a\u306e\u624b\u7d9a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"","vkexunit_cta_each_option":"","footnotes":""},"categories":[34,35,36],"tags":[],"class_list":["post-207","post","type-post","status-publish","format-standard","hentry","category-scheme","category-math","category-reading"],"veu_head_title_object":{"title":"","add_site_title":""},"_links":{"self":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts\/207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=207"}],"version-history":[{"count":0,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts\/207\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}