{"id":946,"date":"2023-07-28T05:30:58","date_gmt":"2023-07-28T05:30:58","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%a7%e1%84%85%e1%85%a5-dplyr-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%91%e1%85%b3%e1%84%85%e1%85%a6%e1%84%8b%e1%85%b5%e1%86%b7%e1%84%8b%e1%85%a6-%e1%84%8e%e1%85%a1\/"},"modified":"2023-07-28T05:30:58","modified_gmt":"2023-07-28T05:30:58","slug":"%e1%84%8b%e1%85%a7%e1%84%85%e1%85%a5-dplyr-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%91%e1%85%b3%e1%84%85%e1%85%a6%e1%84%8b%e1%85%b5%e1%86%b7%e1%84%8b%e1%85%a6-%e1%84%8e%e1%85%a1","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%a7%e1%84%85%e1%85%a5-dplyr-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%91%e1%85%b3%e1%84%85%e1%85%a6%e1%84%8b%e1%85%b5%e1%86%b7%e1%84%8b%e1%85%a6-%e1%84%8e%e1%85%a1\/","title":{"rendered":"Dplyr\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc5ec\ub7ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uacb0\ud569\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"<p><\/p>\n<hr>\n<p>\uc885\uc885 R\uc5d0\uc11c \uc5ec\ub7ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uacb0\ud569\ud558\ub294 \ub370 \uad00\uc2ec\uc774 \uc788\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\ud589\ud788 <span style=\"color: #000000;\"><a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">dplyr<\/a> \ud328\ud0a4\uc9c0\uc758<\/span> <span style=\"color: #000000;\"><a href=\"https:\/\/dplyr.tidyverse.org\/reference\/mutate-joins.html\" target=\"_blank\" rel=\"noopener noreferrer\">left_join()<\/a> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uba74 \uc774 \uc791\uc5c5\uc744 \uc27d\uac8c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4<\/span> .<\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>library(dplyr)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uc608\ub97c \ub4e4\uc5b4 \ub2e4\uc74c\uacfc \uac19\uc740 \uc138 \uac00\uc9c0 \ub370\uc774\ud130 \ud504\ub808\uc784\uc774 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf1 &lt;- data.frame(a = c('a', 'b', 'c', 'd', 'e', 'f'),\n                  b = c(12, 14, 14, 18, 22, 23))\n\ndf2 &lt;- data.frame(a = c('a', 'a', 'a', 'b', 'b', 'b'),\n                  c = c(23, 24, 33, 34, 37, 41))\n\ndf3 &lt;- data.frame(a = c('d', 'e', 'f', 'g', 'h', 'i'),\n                  d = c(23, 24, 33, 34, 37, 41))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uc138 \uac1c\uc758 \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \ud568\uaed8 \uacb0\ud569\ud558\ub824\uba74 \ub450 \uac1c\uc758 \uc67c\ucabd \uc870\uc778\uc744 \ucc28\ub840\ub85c \uc218\ud589\ud558\uba74 \ub429\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#join the three data frames<\/span>\ndf1 %&gt;%\n    <span style=\"color: #3366ff;\">left_join<\/span> (df2, by='a') %&gt;%\n    <span style=\"color: #3366ff;\">left_join<\/span> (df3, by='a')\n\n   abcd\n1 to 12 23 NA\n2 to 12 24 NA\n3 to 12 33 NA\n4 b 14 34 NA\n5 b 14 37 NA\n6 b 14 41 NA\n7 c 14 NA NA\n8 d 18 NA 23\n9th 22 NA 24\n10 f 23 NA 33\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uc774 \uc870\uc778\uc758 \uacb0\uacfc\ub97c \ub370\uc774\ud130 \ud504\ub808\uc784\uc73c\ub85c \uc800\uc7a5\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#join the three data frames and save result as new data frame named all_data<\/span>\nall_data &lt;- df1 %&gt;%\n              <span style=\"color: #3366ff;\">left_join<\/span> (df2, by='a') %&gt;%\n              <span style=\"color: #3366ff;\">left_join<\/span> (df3, by='a')\n\n<span style=\"color: #008080;\">#view summary of resulting data frame\n<\/span>glimpse(all_data)\n\nComments: 10\nVariables: 4\n$ a &lt;chr&gt; \"a\", \"a\", \"a\", \"b\", \"b\", \"b\", \"c\", \"d\", \"e\", \"f\"\n$b&lt;dbl&gt; 12, 12, 12, 14, 14, 14, 14, 18, 22, 23\n$ c &lt;dbl&gt; 23, 24, 33, 34, 37, 41, NA, NA, NA, NA\n$ d &lt;dbl&gt; NA, NA, NA, NA, NA, NA, NA, 23, 24, 33\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>\ucd94\uac00 \ub9ac\uc18c\uc2a4<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/ko\/\u1111\u1175\u11af\u1110\u1165-\u1112\u1162\u11bc-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">R\uc5d0\uc11c \ud589\uc744 \ud544\ud130\ub9c1\ud558\ub294 \ubc29\ubc95<\/a><br \/> <a href=\"https:\/\/statorials.org\/ko\/\u1110\u1169\u11bc\u1100\u1168\u1112\u1161\u11a8\u110b\u1173\u11ab-\u1100\u1161\u11ab\u1103\u1161\u11ab\u1112\u1161\u1100\u1169-\u110c\u1175\u11a8\u110c\u1165\u11b8\u110c\u1165\u11a8\u110b\u1175\u11ab-\u1107\u1161\u11bc\u1107\u1165\u11b8\u110b\u1173\u1105\u1169-\u1100\u1162\u1102\u1167\u11b7\u110b\u1173\u11af-\u1109\u1165\u11af\u1106\u1167\u11bc\u1112\u1161\u1106\u1173\u1105\u1169-\u1110\u1169\u11bc\u1100\u1168\u1105\u1173\u11af-\u1103\u1165-\u1109\u1171\u11b8\u1100\u1166-\u1107\u1162\u110b\u116e\u11af-\u1109\u116e-\u110b\u1175\u11bb\u1109\u1173\u11b8\u1102\u1175\u1103\u1161.\/\" target=\"_blank\" rel=\"noopener noreferrer\">R\uc5d0\uc11c \uc911\ubcf5 \uc904\uc744 \uc81c\uac70\ud558\ub294 \ubc29\ubc95<\/a><br \/> <a href=\"https:\/\/statorials.org\/ko\/\u1100\u1173\u1105\u116e\u11b8-\u110c\u1162\u1100\u1162-\u1103\u1166\u110b\u1175\u1110\u1165-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">R\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uadf8\ub8f9\ud654\ud558\uace0 \uc694\uc57d\ud558\ub294 \ubc29\ubc95<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc885\uc885 R\uc5d0\uc11c \uc5ec\ub7ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uacb0\ud569\ud558\ub294 \ub370 \uad00\uc2ec\uc774 \uc788\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\ud589\ud788 dplyr \ud328\ud0a4\uc9c0\uc758 left_join() \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uba74 \uc774 \uc791\uc5c5\uc744 \uc27d\uac8c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4 . library(dplyr) \uc608\ub97c \ub4e4\uc5b4 \ub2e4\uc74c\uacfc \uac19\uc740 \uc138 \uac00\uc9c0 \ub370\uc774\ud130 \ud504\ub808\uc784\uc774 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4. #create data frame df1 &lt;- data.frame(a = c(&#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;, &#8216;d&#8217;, &#8216;e&#8217;, &#8216;f&#8217;), b = c(12, 14, 14, 18, 22, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-946","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>dplyr\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc5ec\ub7ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uacb0\ud569\ud558\ub294 \ubc29\ubc95 - Statorials<\/title>\n<meta name=\"description\" content=\"dplyr\uc744 \uc0ac\uc6a9\ud558\uc5ec R\uc5d0\uc11c \uc5ec\ub7ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uacb0\ud569\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud55c \uac04\ub2e8\ud55c \uc124\uba85\uc785\ub2c8\ub2e4.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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