{"id":2903,"date":"2023-07-20T04:21:53","date_gmt":"2023-07-20T04:21:53","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b0%e9%bb%98%e8%ae%a4%e7%bc%ba%e5%a4%b1%e9%95%bf%e5%ba%a6\/"},"modified":"2023-07-20T04:21:53","modified_gmt":"2023-07-20T04:21:53","slug":"r-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b0%e9%bb%98%e8%ae%a4%e7%bc%ba%e5%a4%b1%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b0%e9%bb%98%e8%ae%a4%e7%bc%ba%e5%a4%b1%e9%95%bf%e5%ba%a6\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u4fee\u590d\uff1a\u805a\u5408\u51fd\u6570\u7f3a\u5931\uff0c\u9ed8\u8ba4\u4e3a\u201clength\u201d"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u4f7f\u7528R\u65f6\u53ef\u80fd\u9047\u5230\u7684\u9519\u8bef\u662f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong>Aggregation function missing: defaulting to length\n<\/strong><\/span><\/pre>\n<p><span style=\"color: #000000;\">\u5f53\u60a8\u4f7f\u7528<strong>reshape2<\/strong>\u5305\u4e2d\u7684<strong>dcast<\/strong>\u51fd\u6570\u5c06\u6570\u636e\u6846\u4ece<a href=\"https:\/\/statorials.org\/cn\/\u957f\u6570\u636e\u4e0e\u5bbd\u6570\u636e\/\" target=\"_blank\" rel=\"noopener\">\u957f\u683c\u5f0f\u8f6c\u6362\u4e3a\u5bbd\u683c\u5f0f<\/a>\u65f6\uff0c\u4f1a\u51fa\u73b0\u6b64\u9519\u8bef\uff0c\u4f46\u5bbd\u6570\u636e\u6846\u7684\u5404\u4e2a\u5355\u5143\u683c\u4e2d\u53ef\u4ee5\u653e\u7f6e\u591a\u4e2a\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u7ea0\u6b63\u6b64\u9519\u8bef\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5982\u4f55\u91cd\u73b0\u9519\u8bef<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u5047\u8bbe\u6211\u4eec\u5728 R \u4e2d\u6709\u4ee5\u4e0b\u6570\u636e\u6846\uff0c\u5176\u4e2d\u5305\u542b\u6709\u5173\u5404\u79cd\u4ea7\u54c1\u9500\u552e\u7684\u4fe1\u606f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (store=c('A', 'A', 'A', 'A', 'B', 'B', 'B', 'B'),\n                 promotion=c('Y', 'Y', 'N', 'N', 'Y', 'Y', 'N', 'N'),\n                 product=c(1, 2, 1, 2, 1, 2, 1, 2),\n                 sales=c(12, 18, 29, 20, 30, 11, 15, 22))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  store promotion product sales\n1 AY 1 12\n2 AY 2 18\n3 YEAR 1 29\n4 YEAR 2 20\n5 BY 1 30\n6 BY 2 11\n7 BN 1 15\n8 BN 2 22<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528<strong>dcast<\/strong>\u51fd\u6570\u5c06\u6570\u636e\u5e27\u4ece\u957f\u683c\u5f0f\u8f6c\u6362\u4e3a\u5bbd\u683c\u5f0f\uff1a<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (reshape2)\n\n<span style=\"color: #008080;\">#convert data frame to wide format\n<\/span>df_wide &lt;- dcast(df, store ~ product, value. <span style=\"color: #3366ff;\">var<\/span> = \" <span style=\"color: #ff0000;\">sales<\/span> \")\n\n<span style=\"color: #008080;\">#view result\n<\/span>df_wide\n\nAggregation function missing: defaulting to length\n  store 1 2\n1 to 2 2\n2 B 2 2<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0cdcast \u51fd\u6570\u53ef\u4ee5\u5de5\u4f5c\uff0c\u4f46\u6211\u4eec\u6536\u5230<strong>\u805a\u5408\u51fd\u6570\u4e22\u5931<\/strong>\u8b66\u544a\u6d88\u606f\u3002<\/span><\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5982\u4f55\u4fee\u590d\u9519\u8bef<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u6536\u5230\u8b66\u544a\u6d88\u606f\u7684\u539f\u56e0\u662f\uff0c\u5bf9\u4e8e<strong>\u5546\u5e97<\/strong>\u548c<strong>\u4ea7\u54c1<\/strong>\u7684\u6bcf\u79cd\u7ec4\u5408\uff0c\u6211\u4eec\u90fd\u6709\u4e24\u4e2a\u53ef\u4ee5\u7528\u4e8e<strong>\u9500\u552e<\/strong>\u7684\u6f5c\u5728\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5bf9\u4e8e\u5546\u5e97 A \u548c\u4ea7\u54c1 1\uff0c\u9500\u552e\u989d\u53ef\u80fd\u662f 12 \u6216 29\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u56e0\u6b64<strong>dcast<\/strong>\u51fd\u6570\u9ed8\u8ba4\u4f7f\u7528\u201clength\u201d\u4f5c\u4e3a\u5176\u805a\u5408\u51fd\u6570\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5927\u578b\u6570\u636e\u5e93\u544a\u8bc9\u6211\u4eec\uff0c\u5bf9\u4e8e\u5546\u5e97 A \u548c\u4ea7\u54c1 1\uff0c\u603b\u5171\u6709<strong>2 \u4e2a<\/strong>\u9500\u552e\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5982\u679c\u60a8\u60f3\u4f7f\u7528\u4e0d\u540c\u7684\u805a\u5408\u51fd\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528<strong>fun.aggregate<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u6765\u8ba1\u7b97<strong>\u5546\u5e97<\/strong>\u548c<strong>\u4ea7\u54c1<\/strong>\u7684\u9500\u552e\u989d\u603b\u548c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (reshape2)\n\n<span style=\"color: #008080;\">#convert data frame to wide format\n<\/span>df_wide &lt;- dcast(df, store ~ product, value. <span style=\"color: #3366ff;\">var<\/span> = \" <span style=\"color: #ff0000;\">sales<\/span> \", fun. <span style=\"color: #3366ff;\">aggregate<\/span> =sum)\n\n<span style=\"color: #008080;\">#view result<\/span>\ndf_wide\n\n  store 1 2\n1 A 41 38\n2 B 45 33\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u662f\u5982\u4f55\u89e3\u91ca\u5927\u6570\u636e\u6846\u4e2d\u7684\u503c\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u5546\u5e97 A \u548c\u4ea7\u54c1 1 \u7684\u9500\u552e\u989d\u4e4b\u548c\u4e3a<strong>41<\/strong> \u3002<\/span><\/li>\n<li><span style=\"color: #000000;\">\u5546\u5e97 A \u548c\u4ea7\u54c1 2 \u7684\u9500\u552e\u989d\u4e4b\u548c\u4e3a<strong>38<\/strong> \u3002<\/span><\/li>\n<li><span style=\"color: #000000;\">\u5546\u5e97 B \u548c\u4ea7\u54c1 1 \u7684\u9500\u552e\u989d\u4e4b\u548c\u4e3a<strong>45<\/strong> \u3002<\/span><\/li>\n<li><span style=\"color: #000000;\">\u5546\u5e97 B \u548c\u4ea7\u54c1 2 \u7684\u9500\u552e\u989d\u4e4b\u548c\u4e3a<strong>33<\/strong> \u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0c\u8fd9\u6b21\u6211\u4eec\u6ca1\u6709\u6536\u5230\u4efb\u4f55\u8b66\u544a\u6d88\u606f\uff0c\u56e0\u4e3a\u6211\u4eec\u4f7f\u7528\u4e86<strong>fun.aggregate<\/strong>\u53c2\u6570\u3002<\/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\u4fee\u590d R \u4e2d\u7684\u5176\u4ed6\u5e38\u89c1\u9519\u8bef\uff1a<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/cn\/r-\u610f\u5916\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u4fee\u590d R\uff1a\u610f\u5916\u7684\u5b57\u7b26\u4e32\u5e38\u91cf<\/a><br \/>\u5982\u4f55\u4fee\u590d R\uff1aExtractVars \u4e2d\u7684\u6a21\u677f\u516c\u5f0f\u65e0\u6548<br \/> <a href=\"https:\/\/statorials.org\/cn\/r-\u53c2\u6570\u4e0d\u662f\u6570\u5b57\u6216\u903b\u8f91\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 R \u4e2d\u4fee\u590d\uff1a\u53c2\u6570\u65e2\u4e0d\u662f\u6570\u5b57\u4e5f\u4e0d\u662f\u903b\u8f91\uff1a\u8fd4\u56de na<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528R\u65f6\u53ef\u80fd\u9047\u5230\u7684\u9519\u8bef\u662f\uff1a Aggregation function missing: defaulting  [&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-2903","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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