{"id":1888,"date":"2023-07-24T14:21:44","date_gmt":"2023-07-24T14:21:44","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e5%b7%a6%e8%bf%9e%e6%8e%a5-r\/"},"modified":"2023-07-24T14:21:44","modified_gmt":"2023-07-24T14:21:44","slug":"%e5%b7%a6%e8%bf%9e%e6%8e%a5-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e5%b7%a6%e8%bf%9e%e6%8e%a5-r\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u8fdb\u884c\u5de6\u8fde\u63a5\uff08\u9644\u793a\u4f8b\uff09"},"content":{"rendered":"

<\/p>\n

\n

\u60a8\u53ef\u4ee5\u4f7f\u7528merge()<\/strong>\u51fd\u6570\u5728\u57fa R \u4e2d\u6267\u884c\u5de6\u8fde\u63a5\uff1a<\/span><\/p>\n

 #left join using base R<\/span>\nmerge(df1,df2, all. x<\/span> = TRUE<\/span> )\n<\/strong><\/pre>\n
\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528dplyr<\/a>\u5305\u4e2d\u7684left_join()<\/strong>\u51fd\u6570\u6765\u6267\u884c\u5de6\u8fde\u63a5\uff1a<\/span><\/p>\n
 #left join using dplyr\n<\/span>dplyr::left_join(df2, df1)<\/strong><\/pre>\n
\u6ce8\u610f\uff1a<\/strong>\u5982\u679c\u60a8\u6b63\u5728\u5904\u7406\u975e\u5e38\u5927\u7684\u6570\u636e\u96c6\uff0c\u5219 left_join()<\/strong>\u51fd\u6570\u5f80\u5f80\u6bd4merge()<\/strong>\u51fd\u6570\u66f4\u5feb\u3002<\/span><\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u901a\u8fc7\u4ee5\u4e0b\u6570\u636e\u6846\u4f7f\u7528\u6bcf\u4e2a\u51fd\u6570\uff1a<\/span><\/p>\n
 #define first data frame\n<\/span>df1 <- data. frame<\/span> (team=c(' Mavs<\/span> ', ' Hawks<\/span> ', ' Spurs<\/span> ', ' Nets<\/span> '),\n                  dots=c(99, 93, 96, 104))\n\ndf1\n\n   team points\n1 Mavs 99\n2 Hawks 93\n3 Spurs 96\n4 Nets 104\n\n#define second data frame\n<\/span>df2 <- data. frame<\/span> (team=c(' Mavs<\/span> ', ' Hawks<\/span> ', ' Spurs<\/span> ', ' Nets<\/span> '),\n                  rebounds=c(25, 32, 38, 30),\n                  assists=c(19, 18, 22, 25))\n\ndf2\n\n   team rebound assists\n1 Mavs 25 19\n2 Hawks 32 18\n3 Spurs 38 22\n4 Nets 30 25<\/strong><\/pre>\n
\u793a\u4f8b 1\uff1a\u4f7f\u7528 Base R \u8fdb\u884c\u5de6\u8fde\u63a5<\/strong><\/span><\/h2>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u57fa\u7840 R \u4e2d\u7684merge()<\/strong>\u51fd\u6570\u6765\u6267\u884c\u5de6\u8fde\u63a5\uff0c\u4f7f\u7528\u201cteam\u201d\u5217\u4f5c\u4e3a\u8981\u8fde\u63a5\u7684\u5217\uff1a<\/span><\/p>\n
 #perform left join using base R<\/span>\nmerge(df1, df2, by=' team<\/span> ', all. x<\/span> = TRUE<\/span> )\n\n   team points rebound assists\n1 Hawks 93 32 18\n2 Mavs 99 25 19\n3 Nets 104 30 25\n4 Spurs 96 38 22\n<\/strong><\/pre>\n
\u793a\u4f8b 2\uff1a\u4f7f\u7528 dplyr \u8fdb\u884c\u5de6\u8fde\u63a5<\/strong><\/span><\/h2>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 dplyr \u5305\u4e2d\u7684left_join()<\/strong>\u51fd\u6570\u6765\u6267\u884c\u5de6\u8fde\u63a5\uff0c\u4f7f\u7528\u201cteam\u201d\u5217\u4f5c\u4e3a\u8981\u8fde\u63a5\u7684\u5217\uff1a<\/span><\/p>\n
 library<\/span> (dplyr)\n\n#perform left join using dplyr<\/span> \nleft_join(df1, df2, by=' team<\/span> ')\n\n   team points rebound assists\n1 Mavs 99 25 19\n2 Hawks 93 32 18\n3 Spurs 96 38 22\n4 Nets 104 30 25<\/strong><\/pre>\n
\u60a8\u4f1a\u6ce8\u610f\u5230\u8fd9\u4e24\u4e2a\u51fd\u6570\u4e4b\u95f4\u7684\u4e00\u4e2a\u533a\u522b\u662fmerge()<\/strong>\u51fd\u6570\u6839\u636e\u7528\u4e8e\u6267\u884c\u8fde\u63a5\u7684\u5217\u81ea\u52a8\u6309\u5b57\u6bcd\u987a\u5e8f\u5bf9\u884c\u8fdb\u884c\u6392\u5e8f\u3002<\/span><\/p>\n
\u76f8\u53cd\uff0c left_join()<\/strong>\u51fd\u6570\u4fdd\u7559\u7b2c\u4e00\u4e2a\u6570\u636e\u5e27\u4e2d\u884c\u7684\u539f\u59cb\u987a\u5e8f\u3002<\/span><\/p>\n
\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h2>\n
\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u5176\u4ed6\u5e38\u89c1\u64cd\u4f5c\uff1a<\/span><\/p>\n
\u5982\u4f55\u5728 R \u4e2d\u8fdb\u884c\u5185\u8fde\u63a5<\/a>
\u5982\u4f55\u5728R\u4e2d\u8fdb\u884c\u6a21\u7cca\u5339\u914d<\/a>
 \u5982\u4f55\u5728R\u4e2d\u5411\u6570\u636e\u6846\u6dfb\u52a0\u5217<\/a>
\u5982\u4f55\u4eceR\u4e2d\u7684\u6570\u636e\u6846\u4e2d\u5220\u9664\u5217<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u60a8\u53ef\u4ee5\u4f7f\u7528merge()\u51fd\u6570\u5728\u57fa R \u4e2d\u6267\u884c\u5de6\u8fde\u63a5\uff1a #left join using base R merg […]<\/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-1888","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"\n\u5982\u4f55\u5728 R \u4e2d\u8fdb\u884c\u5de6\u8fde\u63a5\uff08\u5e26\u6709\u793a\u4f8b\uff09 \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u5de6\u8fde\u63a5\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\/\u5de6\u8fde\u63a5-r\/\" \/>\n<meta property=\"og:locale\" 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