{"id":18085,"date":"2017-12-12T21:44:08","date_gmt":"2017-12-12T12:44:08","guid":{"rendered":"http:\/\/yukisako.xsrv.jp\/entry\/inner_product"},"modified":"2017-12-12T21:44:08","modified_gmt":"2017-12-12T12:44:08","slug":"inner_product","status":"publish","type":"post","link":"https:\/\/skill-hacks.co.jp\/media\/inner_product\/","title":{"rendered":"\u3010\u6697\u8a18\u3057\u306a\u3044\u6570\u5b66\u3011\u306a\u305c\u5185\u7a4d\u306f\u6210\u5206\u540c\u58eb\u3092\u304b\u3051\u3066\u8db3\u3059\u306e\u304b\u3092\u56f3\u89e3\u3057\u3066\u307f\u308b"},"content":{"rendered":"<p><!-- [mathjax] --><br \/>\n\u9ad8\u68212\u5e74\u751f\u306e\u6570\u5b66\u3067\u7fd2\u3046\u30d9\u30af\u30c8\u30eb\u306e\u5185\u7a4d\uff0e\u30d9\u30af\u30c8\u30eb\u306e\u5185\u7a4d\u306b\u306f2\u7a2e\u985e\u306e\u8868\u8a18\u65b9\u6cd5\u304c\u3042\u308b\u3053\u3068\u306f\u9ad8\u6821\u751f\u306e\u6642\u306b\u3044\u3084\u3068\u3044\u3046\u307b\u3069\u7df4\u7fd2\u3057\u305f\u305f\u3081\uff0c\u307f\u306a\u3055\u3093\u899a\u3048\u3066\u3044\u308b\u306f\u305a\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212213929j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212213929.jpg\" alt=\"f:id:McG:20171212213929j:plain\"><\/p>\n<p>\u305f\u3060\uff0c\u306a\u3093\u304b\u3053\u306e2\u3064\u306e\u5185\u7a4d\u306e\u5f0f\u304c\u540c\u3058\u3082\u306e\u3092\u8868\u3057\u3066\u3044\u308b\u3068\u306f\u76f4\u611f\u7684\u306b\u7406\u89e3\u3067\u304d\u306a\u304b\u3063\u305f\u3093\u3067\u3059\u3088\u306d\uff0e<\/p>\n<p>\u300e\u306a\u3093\u3067\\(\\cos\\theta\\)\u3068\u304b\u304c\u5165\u3063\u305f\u5f0f\u304c\u639b\u3051\u7b97\u3068\u8db3\u3057\u7b97\u306b\u306a\u3063\u3066\u308b\u3093\u3060\u308d\u3046\u2026\uff1f\u300f\u3068\u304b\u3063\u3066\u8003\u3048\u3066\u3057\u307e\u3063\u305f\u3093\u3067\u3059\uff0e<\/p>\n<p><strong>\u6559\u79d1\u66f8\u3067\u306f\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3063\u305f\u89e3\u8aac\u3092\u3057\u3066\u304a\u308a\uff0c\u3082\u3061\u308d\u3093\u7406\u89e3\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u4eca\u56de\u306f\u3082\u3063\u3068\u76f4\u611f\u7684\u306b\u56f3\u5f62\u3092\u4f7f\u3063\u305f\u7406\u89e3\u306e\u65b9\u6cd5\u3092\u304a\u4f1d\u3048\u3057\u307e\u3059\uff01<\/strong><\/p>\n<p><br \/>\n<!-- more --><\/p>\n<h2 id=\"2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u5e73\u884c\u306a\u6642\">2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u5e73\u884c\u306a\u6642<\/h2>\n<p>\u3067\u306f\uff0c\u307e\u305a\u306f2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u5e73\u884c\u306a\u6642\u306e\u3053\u3068\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p>2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u540c\u3058\u5411\u304d\u3092\u5411\u3044\u3066\u3044\u308b\u6642\uff0c\u30d9\u30af\u30c8\u30eb\u304c\u306a\u3059\u89d2\\(\\theta=0\\)\u3067\u3042\u308b\u306e\u3067\uff0c\\(\\cos\\theta = 1\\)\u3068\u306a\u308a\u307e\u3059\uff0e<\/p>\n<p>\u3088\u3063\u3066\uff0c\u5185\u7a4d\u306f\u5358\u7d14\u306b\\(|\\vec{a}|\\cdot|\\vec{b}|\\)\u3068\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214002j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214002.jpg\" alt=\"f:id:McG:20171212214002j:plain\"><\/p>\n<p>\u56f3\u5f62\u7684\u306b\u8003\u3048\u308b\u6642\u306e\u57fa\u672c\u3067\u3059\u304c\uff0c\u300e\u304b\u3051\u7b97\u3092\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u3068\u3057\u3066\u53ef\u8996\u5316\u3057\u3066\u307f\u308b\u300f\u3068\u3044\u3046\u306e\u304c\u3042\u308b\u306e\u3067\u4eca\u56de\u3082\u4f8b\u306b\u3088\u3063\u3066\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u3068\u3057\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214012j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214012.jpg\" alt=\"f:id:McG:20171212214012j:plain\"><\/p>\n<p>\u3053\u308c\u3092\u3055\u3089\u306b\u8a00\u3044\u63db\u3048\u308b\u3068\uff0c\u300e\u5185\u7a4d\u3068\u306f\uff0c\u300c\\(\\vec{a}\\)\u300d\u3068\uff0c\u300c\\(\\vec{b}\\)\u309290\u5ea6\u56de\u8ee2\u3055\u305b\u305f\u30d9\u30af\u30c8\u30eb\u300d\u306b\u3088\u3063\u3066\u3067\u304d\u308b\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u3067\u3042\u308b\u300f\u3068\u8a00\u3048\u307e\u3059\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214038j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214038.jpg\" alt=\"f:id:McG:20171212214038j:plain\"><\/p>\n<p>\u305d\u308c\u3067\u306f\uff0c\u4eca\u4f5c\u6210\u3057\u305f\u56f3\u306b\u305d\u308c\u305e\u308c\u306e\u30d9\u30af\u30c8\u30eb\u306ex\u65b9\u5411\u6210\u5206\u53ca\u3073y\u65b9\u5411\u6210\u5206\u3092\u66f8\u304d\u8fbc\u3093\u3067\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214105j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214105.jpg\" alt=\"f:id:McG:20171212214105j:plain\"><\/p>\n<p>\u6700\u5f8c\u306b\uff0c\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308b\u3088\u3046\u306b\u4e00\u90e8\u306e\u4e09\u89d2\u5f62\u3092\u79fb\u52d5\u3055\u305b\u3066\u9762\u7a4d\u3092\u6c42\u3081\u3066\u307f\u308b\u3068\u2026 \u306f\u3044\uff0c\u9762\u7a4d\u304c\\(x_a x_b + y_a y_b\\)\u306b\u306a\u308a\u307e\u3057\u305f\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214133j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214133.jpg\" alt=\"f:id:McG:20171212214133j:plain\"><\/p>\n<p>\u4eca\u306f\uff0c\u300e2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u5e73\u884c\u306a\u6642\u300f\u3068\u3044\u3046\u9650\u5b9a\u7684\u306a\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u305f\u304c\uff0c\u76f4\u611f\u7684\u306b\\(|\\vec{a}|\\cdot|\\vec{b}|\\)\u3068\\(x_a x_b + y_a y_b\\)\u304c\u540c\u3058\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u304c\u7406\u89e3\u3067\u304d\u305f\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<h2 id=\"\u3053\u308c\u3092\u4e00\u822c\u5316\u3057\u3066\u307f\u308b\">\u3053\u308c\u3092\u4e00\u822c\u5316\u3057\u3066\u307f\u308b<\/h2>\n<p>\u3067\u306f\uff0c\u3053\u308c\u3092\u4e00\u822c\u5316\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p>\u5148\u307b\u3069\u306e\u3088\u3046\u306b2\u672c\u306e\u30d9\u30af\u30c8\u30eb\u304c\u5e73\u884c\u3067\u3042\u308b\u6642\u306f\uff0c<strong>\u300e\\(\\vec{a}\\)\u300f\u3068\u300e\\(\\vec{b}\\)\u309290\u5ea6\u56de\u8ee2\u3055\u305b\u305f\u30d9\u30af\u30c8\u30eb\u300f\u306b\u3088\u3063\u3066\u3067\u304d\u308b\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u304c\u5185\u7a4d\u306b\u306a\u308b\u306e\u3067\u3057\u305f<\/strong><\/p>\n<p>\u305d\u308c\u3067\u306f\u4e00\u822c\u5316\u306e\u969b\u3082\u5148\u307b\u3069\u3068\u540c\u69d8\u306b\uff0c<b>\u300e\\(\\vec{b}\\)\u3060\u305190\u5ea6\u3060\u3051\u56de\u8ee2\u3055\u305b\u305f\u6642\u306b\u51fa\u73fe\u3059\u308b\u56f3\u5f62\u306e\u9762\u7a4d\u300f<\/b>\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214215j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214215.jpg\" alt=\"f:id:McG:20171212214215j:plain\"><\/p>\n<p><strong>\u305d\u3046\uff0c\u3053\u306e\u3088\u3046\u306b\u4e00\u822c\u5316\u3057\u305f\u5834\u5408\u306b\u306f\u300e\\(\\vec{a}\\)\u300f\u3068\u300e\\(\\vec{b}\\)\u309290\u5ea6\u56de\u8ee2\u3055\u305b\u305f\u30d9\u30af\u30c8\u30eb\u300f\u306b\u3088\u3063\u3066\u3067\u304d\u308b\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u304c\u5185\u7a4d\u306b\u306a\u308b\u3093\u3067\u3059<\/strong><\/p>\n<p>\u305d\u308c\u3067\u306f\uff0c\u3053\u306e\u5e73\u884c\u56db\u8fba\u5f62\u306b\u6210\u5206\u8868\u8a18\u3092\u4ed8\u3051\u52a0\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214242j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214242.jpg\" alt=\"f:id:McG:20171212214242j:plain\"><\/p>\n<p>\u6700\u5f8c\u306b\uff0c\u3053\u306e\u6c34\u8272\u306e\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u305f\u3044\u308f\u3051\u3067\u3059\u304c\uff0c\u5c11\u3057\u5f62\u304c\u8907\u96d1\u306a\u306e\u3067\u5f15\u304d\u7b97\u3092\u4f7f\u3063\u3066\u3044\u304d\u307e\u3059\uff0e<\/p>\n<p>\u5927\u304d\u3044\u9577\u65b9\u5f62\u304b\u3089\u5468\u308a\u306e\u4e09\u89d2\u5f62\u3092\u5f15\u304f\u3053\u3068\u3067\u6c34\u8272\u306e\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u307e\u3059\uff0e<\/p>\n<p><img decoding=\"async\" class=\"hatena-fotolife\" title=\"f:id:McG:20171212214253j:plain\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/M\/McG\/20171212\/20171212214253.jpg\" alt=\"f:id:McG:20171212214253j:plain\"><\/p>\n<p><strong>\u6c34\u8272\u306e\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u304c\u5b9f\u306f2\u3064\u306e\u30d9\u30af\u30c8\u30eb\u306e\u6210\u5206\u540c\u58eb\u304b\u3051\u3066\u8db3\u3057\u305f\u3082\u306e\u3067\u3042\u308b\u300e\\(x_a x_b + y_a y_b\\)\u300f\u3067\u8868\u3055\u308c\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f<\/strong><\/p>\n<p>\u3053\u3053\u3067\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u3068\u306f\u4f55\u3092\u8868\u3057\u3066\u3044\u305f\u304b\u3068\u3044\u3046\u3068\uff0c\u30d9\u30af\u30c8\u30eb\u306e\u5185\u7a4d\u300c\\(|\\vec{a}|\\cdot|\\vec{b}|\\cos\\theta]\\)\u300d\u306e\u3053\u3068\u3067\u3057\u305f\u306d\uff0e<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\uff0c\u300e\\(|\\vec{a}|\\cdot|\\vec{b}|\\cos\\theta&nbsp; = x_ax_b+y_by_a\\)\u300f\u304c\u6210\u308a\u7acb\u3064\u3053\u3068\u3092\u8996\u899a\u7684\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f<\/p>\n<h2 id=\"\u6700\u5f8c\u306b\">\u6700\u5f8c\u306b<\/h2>\n<p>\u5185\u7a4d\u306a\u3093\u3066\uff0c\u7406\u7cfb\u306e\u65b9\u306b\u3068\u3063\u3066\u306f\u606f\u3092\u3059\u308b\u306e\u3068\u540c\u3058\u30ec\u30d9\u30eb\u306e\u5e38\u8b58\u4e8b\u9805\u306a\u306e\u3067\u4eca\u66f4\u3068\u306f\u601d\u3044\u307e\u3059\u304c\uff0c\u3053\u3046\u3084\u3063\u3066\u5c11\u3057\u9055\u3046\u8996\u70b9\u304b\u3089\u307f\u3066\u307f\u308b\u306e\u3063\u3066\u9762\u767d\u3044\u3057\u30ef\u30af\u30ef\u30af\u3057\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>\u4ed6\u306b\u3082\uff0c\u6298\u308a\u7d19\u3092\u4f7f\u3063\u3066\u7406\u89e3\u3059\u308b\u52a0\u6cd5\u5b9a\u7406\u3084\u5185\u7a4d\u3068\u76f8\u95a2\u4fc2\u6570\u304c\u3081\u3063\u3061\u3083\u4f3c\u3066\u308b\u8a71\u306a\u3069\u8272\u3005\u306a\u8a18\u4e8b\u304c\u3042\u308b\u306e\u3067\u8208\u5473\u304c\u3042\u308c\u3070\u305c\u3072\uff01<\/p>\n<div class=\"date-box\">\n<div class=\"date-midashi\">\u95a2\u9023\u8a18\u4e8b<\/div>\n<div class=\"date-content\">\n<p><i class=\"fa fa-arrow-circle-right\"><\/i><a href=\"https:\/\/www.yukisako.xyz\/entry\/correlation-coefficient\">\u3010\u6697\u8a18\u3057\u306a\u3044\u6570\u5b66\u3011\u76f8\u95a2\u4fc2\u6570\u3092\u5185\u7a4d\u3068\u540c\u3058\u3088\u3046\u306b\u8003\u3048\u308b\u3068\u304b\u306a\u308a\u5206\u304b\u308a\u3084\u3059\u3044\u4ef6<\/a><\/p>\n<p><i class=\"fa fa-arrow-circle-right\"><\/i><a href=\"https:\/\/www.yukisako.xyz\/entry\/kahouteiri\">\u6298\u308a\u7d19\u4e00\u679a\u3067\u8a3c\u660e\u3059\u308b\u4e09\u89d2\u95a2\u6570\u306e\u52a0\u6cd5\u5b9a\u7406<\/a><\/p>\n<p><i class=\"fa fa-arrow-circle-right\"><\/i><a href=\"https:\/\/www.yukisako.xyz\/entry\/sigma\">\u3010\u6697\u8a18\u3057\u306a\u3044\u6570\u5b66\u3011\u56f3\u5f62\u3067\u7406\u89e3\u3059\u308b\u30b7\u30b0\u30de\u516c\u5f0f<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u9ad8\u68212\u5e74\u751f\u306e\u6570\u5b66\u3067\u7fd2\u3046\u30d9\u30af\u30c8\u30eb\u306e\u5185\u7a4d\uff0e\u30d9\u30af\u30c8\u30eb\u306e\u5185\u7a4d\u306b\u306f2\u7a2e\u985e\u306e\u8868\u8a18\u65b9\u6cd5\u304c\u3042\u308b\u3053\u3068\u306f\u9ad8\u6821\u751f\u306e\u6642\u306b\u3044\u3084\u3068\u3044\u3046\u307b\u3069\u7df4\u7fd2\u3057\u305f\u305f\u3081\uff0c\u307f\u306a\u3055\u3093\u899a\u3048\u3066\u3044\u308b\u306f\u305a\uff0e \u305f\u3060\uff0c\u306a\u3093\u304b\u3053\u306e2\u3064\u306e\u5185\u7a4d\u306e\u5f0f\u304c\u540c\u3058\u3082\u306e\u3092\u8868\u3057\u3066\u3044\u308b\u3068\u306f\u76f4\u611f\u7684\u306b\u7406\u89e3\u3067 &#8230; 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