{"id":1103,"date":"2023-07-27T16:04:00","date_gmt":"2023-07-27T16:04:00","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e7%9a%84%e7%82%b9%e7%a7%af\/"},"modified":"2023-07-27T16:04:00","modified_gmt":"2023-07-27T16:04:00","slug":"r-%e4%b8%ad%e7%9a%84%e7%82%b9%e7%a7%af","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e7%9a%84%e7%82%b9%e7%a7%af\/","title":{"rendered":"\u5982\u4f55\u8ba1\u7b97 r \u4e2d\u7684\u70b9\u79ef\uff1a\u4e3e\u4f8b"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u7ed9\u5b9a\u5411\u91cf<em>a<\/em> = [a <sub>1<\/sub> , a <sub>2<\/sub> , a <sub>3<\/sub> ] \u548c\u5411\u91cf<em>b<\/em> = [b <sub>1<\/sub> , b <sub>2<\/sub> , b <sub>3<\/sub> ]\uff0c\u5411\u91cf a \u548c\u5411\u91cf b \u7684<strong>\u6807\u91cf\u79ef<\/strong>\uff08\u8868\u793a\u4e3a<strong>ab<\/strong> \uff09\u7531\u4e0b\u5f0f\u7ed9\u51fa\uff1a<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab<\/strong> = a <sub>1<\/sub> * b <sub>1<\/sub> + a <sub>2<\/sub> * b <sub>2<\/sub> + a <sub>3<\/sub> * b <sub>3<\/sub><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5982\u679c<em>a<\/em> = [2, 5, 6] \u4e14<em>b<\/em> = [4, 3, 2]\uff0c\u5219<em>a<\/em>\u548c<em>b<\/em>\u7684\u70b9\u79ef\u5c06\u7b49\u4e8e\uff1a<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 2*4 + 5*3 + 6*2<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 8 + 15 + 12<\/span><\/p>\n<p style=\"text-align: center;\"> <span style=\"color: #000000;\"><strong>ab =<\/strong> 35<\/span><\/p>\n<p><span style=\"color: #000000;\">\u672c\u8d28\u4e0a\uff0c\u70b9\u79ef\u662f\u4e24\u4e2a\u5411\u91cf\u4e2d\u76f8\u5e94\u6761\u76ee\u7684\u4e58\u79ef\u4e4b\u548c\u3002<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>\u5982\u4f55\u8ba1\u7b97R\u4e2d\u7684\u70b9\u79ef<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">R\u4e2d\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5feb\u901f\u8ba1\u7b97\u4e24\u4e2a\u5411\u91cf\u7684\u70b9\u79ef\uff1a<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528%*%<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528<strong>%*%<\/strong>\u51fd\u6570\u8ba1\u7b97 R \u4e2d\u4e24\u4e2a\u5411\u91cf\u4e4b\u95f4\u7684\u70b9\u79ef\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#definevectors<\/span>\na &lt;- c(2, 5, 6)\nb &lt;- c(4, 3, 2)\n\n<span style=\"color: #008080;\">#calculate dot product between vectors\n<\/span>a %*% b\n\n     [,1]\n[1,] 35<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u70b9\u79ef\u7ed3\u679c\u4e3a<strong>35<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0c\u6b64\u51fd\u6570\u4e5f\u9002\u7528\u4e8e\u6570\u636e\u6846\u5217\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define data<\/span>\ndf &lt;- data.frame(a=c(2, 5, 6),\n                 b=c(4, 3, 2))\n\n<span style=\"color: #008080;\">#calculate dot product between columns 'a' and 'b' of data frame\n<\/span>df$a %*% df$b\n\n     [,1]\n[1,] 35<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><strong>\u65b9\u6cd52\uff1a\u4f7f\u7528dot()\u51fd\u6570<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>pracma<\/strong>\u5e93\u4e2d\u7684<strong>dot()<\/strong>\u51fd\u6570\u8ba1\u7b97\u4e24\u4e2a\u5411\u91cf\u4e4b\u95f4\u7684\u70b9\u79ef\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #993300;\">library<\/span> (pracma)<\/span>\n\n#definevectors<\/span>\na &lt;- c(2, 5, 6)\nb &lt;- c(4, 3, 2)\n\n<span style=\"color: #008080;\">#calculate dot product between vectors\n<\/span>dot(a,b)\n\n[1] 35<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u540c\u6837\uff0c\u4e24\u4e2a\u5411\u91cf\u4e4b\u95f4\u7684\u70b9\u79ef\u7ed3\u679c\u4e3a<strong>35<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u76f8\u5173\uff1a<\/strong><a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684\u4e58\u79ef\u4ea4\u53c9\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u8ba1\u7b97 R \u4e2d\u7684\u53c9\u79ef<\/a><\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u4f7f\u7528\u5176\u4ed6\u7edf\u8ba1\u8f6f\u4ef6\u8ba1\u7b97\u70b9\u79ef\uff1a<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/cn\/\u5982\u4f55\u5728excel\u4e2d\u8f7b\u677e\u8ba1\u7b97dote\u4e58\u79ef\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728 Excel \u4e2d\u8ba1\u7b97\u70b9\u79ef<\/a><br \/> <a href=\"https:\/\/statorials.org\/cn\/\u70b9\u79ef\u8c37\u6b4c\u8868\u683c\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728 Google \u8868\u683c\u4e2d\u8ba1\u7b97\u70b9\u79ef<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u70b9\u79ef-ti-84\/\">\u5982\u4f55\u5728 TI-84 \u8ba1\u7b97\u5668\u4e0a\u8ba1\u7b97\u70b9\u79ef<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u5411\u91cfa = [a 1 , a 2 , a 3 ] \u548c\u5411\u91cfb = [b 1 , b 2 , b 3 ]\uff0c\u5411\u91cf [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1103","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u4f55\u8ba1\u7b97 R \u4e2d\u7684\u70b9\u79ef\uff08\u9644\u793a\u4f8b\uff09- Statory<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97\u70b9\u79ef\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684\u70b9\u79ef\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta 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