{"id":123,"date":"2012-06-11T20:40:04","date_gmt":"2012-06-11T11:40:04","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=123"},"modified":"2013-04-24T22:23:44","modified_gmt":"2013-04-24T13:23:44","slug":"%e5%86%86%e5%91%a8%e7%8e%87%e3%82%92%e3%83%a2%e3%83%b3%e3%83%86%e3%82%ab%e3%83%ab%e3%83%ad%e6%b3%95%e3%81%a7%e6%b1%82%e3%82%81%e3%82%8b","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=123","title":{"rendered":"\u5186\u5468\u7387\u3092\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u3067\u6c42\u3081\u308b"},"content":{"rendered":"<p><font size=\"3\">\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u3068\u3044\u3046\u4e71\u6570\u30b7\u30e5\u30df\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u5186\u5468\u7387\u3092\u5c0e\u304d\u51fa\u3057\u3066\u307f\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u534a\u5f84 r \u306e\u5186\u306e\u9762\u7a4d\u306f PI * r^2 \u3067\u3059\u3088\u306d\u3002<\/font><\/p>\n<p><font size=\"3\">\u534a\u5f84 r \u3092 1 \u3068\u3057\u305f\u5186\u3092\u4e2d\u5fc3\u304b\u3089\u5341\u6587\u5b57\u306b\u56db\u7b49\u5206\u3057\u305f\u53f3\u4e0a\u306e\u90e8\u5206\u3092\u4f7f\u3063\u3066\u5186\u5468\u7387\u3092\u6c42\u3081\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u5186\u306e\u4e2d\u5fc3\u304b\u3089\u8fba\u306e\u9577\u3055 1 \u306e\u6b63\u65b9\u5f62\u3092\u91cd\u306d\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u6b63\u65b9\u5f62\u306e\u4e2d\u306b\u306f\uff14\u7b49\u5206\u3055\u308c\u305f\u53f3\u4e0a\u306e\u90e8\u5206\u306e\u6247\u5f62\u306e\u5186\u304c\u304d\u3063\u3061\u308a\u534a\u5f84 1 \u306e\u72b6\u614b\u3067\u3042\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3053\u306e\u6642 x \u8ef8\u3001y \u8ef8\u306e 1 \u306e\u4f4d\u7f6e\u306f\u91cd\u306d\u305f\u6b63\u65b9\u5f62\u306e\u8fba\u306e\u9577\u3055 1 \u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/font><\/p>\n<p><font size=\"3\">\u3088\u3063\u3066\u3001\u6b63\u65b9\u5f62\u306e\u9762\u7a4d : \u6247\u306e\u9762\u7a4d = 1 : PI \/ 4 \u3068\u306a\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3057\u305f\u304c\u3063\u3066 PI \u3092\u6c42\u3081\u308b\u5f0f\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">PI = 4 * \u6247\u306e\u9762\u7a4d\/\u6b63\u65b9\u5f62\u306e\u9762\u7a4d <\/font><\/p>\n<p><font size=\"3\">\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u4e71\u6570\u3092\u4f7f\u3063\u3066\u3053\u306e\u6b63\u65b9\u5f62\u306e\u4e2d\u306b\u305f\u304f\u3055\u3093\u306e\u91dd\u3092\u843d\u3068\u3057\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u91dd\u306e\u843d\u3061\u305f\u4f4d\u7f6e\u304c\u6247\u306e\u4e2d\u304b\u5916\u304b\u3067\u5186\u5468\u7387\u3092\u6c42\u3081\u3066\u3044\u304f\u3068\u3044\u3046\u529b\u6280\u306e\u65b9\u6cd5\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u843d\u3068\u3059\u91dd\u306e\u6570\u304c\u591a\u3044\u307b\u3069\u7cbe\u5ea6\u306f\u4e0a\u304c\u308b\u7406\u5c48\u3067\u3059\u304c\u51e6\u7406\u6642\u9593\u3082\u5897\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3068\u308a\u3042\u3048\u305a\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/font>&nbsp;<\/p>\n<p><font size=\"3\"><\/font>&nbsp;<\/p>\n<p><font size=\"3\"><\/font><\/p>\n<style type=\"text\/css\">\n<!--\ntable {color: #000000; background-color: #e9e8e2; font-family: \u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09}\n\n-->\n<\/style>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">jp\\yucchi\\montecarlo_pi\\Montecarlo_PI.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage jp.yucchi.montecarlo_pi;\r\n\r\nimport java.util.Random;\r\n\r\npublic class Montecarlo_PI {\r\n\r\n    private static final int NEEDLE = 100000000;\r\n\r\n    public static void main(String[] args) {\r\n        int hitCount = 0;\r\n        double x, y, pi;\r\n        for (int i = 0; i < NEEDLE; i++) {\r\n            x = Math.random();\r\n            y = Math.random();\r\n            if (Math.pow(x, 2.0) + Math.pow(y, 2.0) < 1.0) {\r\n                hitCount++;\r\n            }\r\n        }\r\n        pi = 4.0 * hitCount \/ NEEDLE;\r\n        System.out.println(\"\uff2d\uff41\uff54\uff48\u30af\u30e9\u30b9\u306b\u3088\u308b\u5186\u5468\u7387\u306f \" + Math.PI);\r\n        System.out.println(\"\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u306b\u3088\u308b\u5186\u5468\u7387\u306f \" + pi);\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><font size=\"3\">\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br \/><\/font><\/p>\n<p><font size=\"3\">run:<br \/>\uff2d\uff41\uff54\uff48\u30af\u30e9\u30b9\u306b\u3088\u308b\u5186\u5468\u7387\u306f 3.141592653589793<br \/>\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u306b\u3088\u308b\u5186\u5468\u7387\u306f 3.14185944<br \/>\u69cb\u7bc9\u6210\u529f (\u5408\u8a08\u6642\u9593: 9 \u79d2)<br \/><\/font><\/p>\n<p><font size=\"3\">\u4f55\u56de\u304b\u3084\u3063\u3066\u898b\u305f\u306e\u3067\u3059\u304c\u5c0f\u6570\u70b9\u4ee5\u4e0b\uff13\u4f4d\u304f\u3089\u3044\u307e\u3067\u306e\u7cbe\u5ea6\u3057\u304b\u3067\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u7cbe\u5ea6\u3092\u4e0a\u3052\u308b\u306b\u306f\u3053\u306e\u51e6\u7406\u3092\u6570\u56de\uff08\u6570\u4e07\u56de\uff1f\uff09\u7e70\u308a\u8fd4\u3057\u3066\u5e73\u5747\u3092\u3068\u308c\u3070\u3044\u3044\u306e\u304b\u306a\u3041\u30fb\u30fb\u30fb\uff1f<\/font><\/p>\n<div style=\"padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; float: none; padding-top: 0px\" id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:63fafb00-f891-4874-8783-189981eb999b\" class=\"wlWriterEditableSmartContent\">Hatena \u30bf\u30b0: <a href=\"http:\/\/b.hatena.ne.jp\/t\/Java\" rel=\"tag\">Java<\/a><\/div>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_hatena\"><a href='\/\/b.hatena.ne.jp\/add?mode=confirm&url=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D123&title=%E5%86%86%E5%91%A8%E7%8E%87%E3%82%92%E3%83%A2%E3%83%B3%E3%83%86%E3%82%AB%E3%83%AB%E3%83%AD%E6%B3%95%E3%81%A7%E6%B1%82%E3%82%81%E3%82%8B' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/hatena.gif' alt='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' width='16' height='12' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_facebook\"><a href='http:\/\/www.facebook.com\/share.php?u=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D123&t=%E5%86%86%E5%91%A8%E7%8E%87%E3%82%92%E3%83%A2%E3%83%B3%E3%83%86%E3%82%AB%E3%83%AB%E3%83%AD%E6%B3%95%E3%81%A7%E6%B1%82%E3%82%81%E3%82%8B' title='Facebook \u306b\u30b7\u30a7\u30a2' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/facebook.png' alt='Facebook \u306b\u30b7\u30a7\u30a2' title='Facebook \u306b\u30b7\u30a7\u30a2' width='16' height='16' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_google_plus_one\"><g:plusone size=\"medium\" annotation=\"none\" href=\"http:\/\/yucchi.jp\/blog\/?p=123\" ><\/g:plusone><\/div>\n            <div class=\"wsbl_twitter\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" data-url=\"http:\/\/yucchi.jp\/blog\/?p=123\" data-text=\"\u5186\u5468\u7387\u3092\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u3067\u6c42\u3081\u308b\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u3068\u3044\u3046\u4e71\u6570\u30b7\u30e5\u30df\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u5186\u5468\u7387\u3092\u5c0e\u304d\u51fa\u3057\u3066\u307f\u307e\u3059\u3002 \u534a\u5f84 r \u306e\u5186\u306e\u9762\u7a4d\u306f PI * r^2 \u3067\u3059\u3088\u306d\u3002 \u534a\u5f84 r \u3092 1 \u3068\u3057\u305f\u5186\u3092\u4e2d\u5fc3\u304b\u3089\u5341\u6587\u5b57\u306b\u56db\u7b49\u5206\u3057\u305f\u53f3\u4e0a\u306e\u90e8\u5206\u3092\u4f7f\u3063\u3066\u5186\u5468\u7387\u3092\u6c42\u3081\u307e\u3059\u3002 \u5186\u306e\u4e2d\u5fc3\u304b\u3089\u8fba\u306e\u9577\u3055 1 \u306e\u6b63\u65b9\u5f62\u3092\u91cd\u306d\u307e\u3059\u3002 \u6b63\u65b9\u5f62\u306e\u4e2d\u306b\u306f\uff14\u7b49\u5206\u3055\u308c\u305f\u53f3\u4e0a\u306e\u90e8\u5206\u306e\u6247\u5f62\u306e\u5186\u304c\u304d\u3063\u3061\u308a\u534a\u5f84 1 \u306e\u72b6\u614b\u3067\u3042\u308a\u307e\u3059\u3002 \u3053\u306e\u6642 x \u8ef8\u3001y \u8ef8\u306e 1 \u306e\u4f4d\u7f6e\u306f\u91cd\u306d\u305f\u6b63\u65b9\u5f62\u306e\u8fba\u306e\u9577\u3055 1 \u306b\u306a\u308a\u307e\u3059\u306d\u3002 \u3088\u3063\u3066\u3001\u6b63\u65b9\u5f62\u306e\u9762\u7a4d : \u6247\u306e\u9762\u7a4d = 1 : PI \/ 4 \u3068\u306a\u308a\u307e\u3059\u3002 \u3057\u305f\u304c\u3063\u3066 PI \u3092\u6c42\u3081\u308b\u5f0f\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 PI = 4 * \u6247\u306e\u9762\u7a4d\/\u6b63\u65b9\u5f62\u306e\u9762\u7a4d\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-123","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/123","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=123"}],"version-history":[{"count":6,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/123\/revisions"}],"predecessor-version":[{"id":841,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/123\/revisions\/841"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=123"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=123"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}