{"id":1184,"date":"2023-07-27T09:13:26","date_gmt":"2023-07-27T09:13:26","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba-r-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f\/"},"modified":"2023-07-27T09:13:26","modified_gmt":"2023-07-27T09:13:26","slug":"%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba-r-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba-r-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\uff08\u9644\u793a\u4f8b\uff09"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u901a\u5e38\uff0c\u5f53\u60a8\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u6570\u636e\u5bfc\u5165\u5230 R \u4e2d\u65f6\uff0c\u8fd9\u4e9b\u503c\u5c06\u4f5c\u4e3a\u5b57\u7b26\u4e32\u5bfc\u5165\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5728 R \u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u662f\u4f7f\u7528<strong>as.Date()<\/strong>\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>like.Date(x, \u683c\u5f0f)<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u91d1\u5b50\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x\uff1a<\/strong>\u5355\u4e2a\u5b57\u7b26\u4e32\u503c\u6216\u5b57\u7b26\u4e32\u503c\u5411\u91cf\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>format\uff1a<\/strong>\u65e5\u671f\u4f7f\u7528\u7684\u683c\u5f0f\u3002\u9ed8\u8ba4\u503c\u4e3a YYYY-MM-DD\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5\u4f7f\u7528 R \u4e2d\u7684<strong>?strftime<\/strong>\u547d\u4ee4\u6765\u663e\u793a\u7528\u4e8e\u65e5\u671f\u683c\u5f0f\u7684\u53ef\u7528\u53c2\u6570\u7684\u5b8c\u6574\u5217\u8868\uff0c\u4f46\u6700\u5e38\u89c1\u7684\u5305\u62ec\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>%d\uff1a<\/strong>\u5341\u8fdb\u5236\u6570\u5f62\u5f0f\u7684\u6708\u4efd\u65e5\u671f (01-31)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%m\uff1a<\/strong>\u5341\u8fdb\u5236\u6570\u5f62\u5f0f\u7684\u6708\u4efd (01-12)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%y\uff1a<\/strong>\u4e0d\u5e26\u4e16\u7eaa\u7684\u5e74\u4efd\uff08\u4f8b\u5982 04\uff09<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>%Y\uff1a<\/strong>\u5e26\u6709\u4e16\u7eaa\u7684\u5e74\u4efd\uff08\u4f8b\u5982 2004\uff09<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u5c55\u793a\u4e86<strong>as.Date()<\/strong>\u51fd\u6570\u5b9e\u9645\u4f7f\u7528\u7684\u51e0\u4e2a\u793a\u4f8b\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u793a\u4f8b 1\uff1a\u5c06\u5355\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u5c06\u5355\u4e2a\u5b57\u7b26\u4e32\u503c\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create string value<\/span>\nx &lt;- c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \")\n\n<span style=\"color: #008080;\">#convert string to date<\/span>\nnew &lt;- as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\nnew\n\n[1] \"2021-07-24\"\n\n<span style=\"color: #008080;\">#check class of new variable\n<\/span>class(new)\n\n[1] \u201cDate\u201d\n<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u793a\u4f8b 2\uff1a\u5c06\u5b57\u7b26\u4e32\u5411\u91cf\u8f6c\u6362\u4e3a\u65e5\u671f<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u5411\u91cf\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create vector of strings<\/span>\nx &lt;- c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \")\n\n<span style=\"color: #008080;\">#convert string to date<\/span>\nnew &lt;- as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\nnew\n\n[1] \"2021-07-24\" \"2021-07-26\" \"2021-07-30\"\n\n<span style=\"color: #008080;\">#check class of new variable\n<\/span>class(new)\n\n[1] \u201cDate\u201d<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u793a\u4f8b 3\uff1a\u5c06\u6570\u636e\u6846\u5217\u8f6c\u6362\u4e3a\u65e5\u671f<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u5c06\u4e00\u5217\u6570\u636e\u533a\u5757\u94fe\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(day = c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \"),\n                 sales=c(22, 25, 28),\n                 products=c(3, 6, 7))\n\n<span style=\"color: #008080;\">#view structure of data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $ day: Factor w\/ 3 levels \"2021-07-24\",\"2021-07-26\",..: 1 2 3\n $ sales: num 22 25 28\n $products: num 3 6 7\n\n<span style=\"color: #008080;\">#convert <i>day<\/i> variable to date<\/span>\ndf$day &lt;- as.Date(df$day, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \")\n\n<span style=\"color: #008080;\">#view structure of new data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $day: Date, format: \"2021-07-24\" \"2021-07-26\" ...\n $ sales: num 22 25 28\n $products: num 3 6 7\n<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u793a\u4f8b 4\uff1a\u5c06\u591a\u4e2a\u65e5\u671f\u8303\u56f4\u5217\u8f6c\u6362\u4e3a\u65e5\u671f<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u5c06\u591a\u5217\u6570\u636e\u533a\u5757\u94fe\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(start = c(\" <span style=\"color: #008000;\">2021-07-24<\/span> \", \" <span style=\"color: #008000;\">2021-07-26<\/span> \", \" <span style=\"color: #008000;\">2021-07-30<\/span> \"),\n                 end = c(\" <span style=\"color: #008000;\">2021-07-25<\/span> \", \" <span style=\"color: #008000;\">2021-07-28<\/span> \", \" <span style=\"color: #008000;\">2021-08-02<\/span> \"),\n                 products=c(3, 6, 7))\n\n<span style=\"color: #008080;\">#view structure of data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $ start: Factor w\/ 3 levels \"2021-07-24\",\"2021-07-26\",..: 1 2 3\n $ end: Factor w\/ 3 levels \"2021-07-25\",\"2021-07-28\",..: 1 2 3\n $products: num 3 6 7\n\n<span style=\"color: #008080;\">#convert <i>start<\/i> and <em>end<\/em> variables to date<\/span>\ndf[,c(' <span style=\"color: #008000;\">start<\/span> ', ' <span style=\"color: #008000;\">end<\/span> ')] = <span style=\"color: #3366ff;\">lapply<\/span> (df[,c(' <span style=\"color: #008000;\">start<\/span> ', ' <span style=\"color: #008000;\">end<\/span> ')],\n                                function(x) as.Date(x, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \"))\n\n<span style=\"color: #008080;\">#view structure of new data frame\n<\/span>str(df)\n\n'data.frame': 3 obs. of 3 variables:\n $start: Date, format: \"2021-07-24\" \"2021-07-26\" ...\n $end: Date, format: \"2021-07-25\" \"2021-07-28\" ...\n $products: num 3 6 7<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5<a href=\"https:\/\/statorials.org\/cn\/\u5728-r-\u4e2d\u5e94\u7528-lapply-sapply-\u548c-tapply-\u7684\u6307\u5357\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5728\u6b64\u5904<\/a>\u4e86\u89e3\u6709\u5173\u6b64\u793a\u4f8b\u4e2d\u4f7f\u7528\u7684<strong>lapply()<\/strong>\u51fd\u6570\u7684\u66f4\u591a\u4fe1\u606f\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\u63d0\u4f9b\u4e86\u6709\u5173\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528\u65e5\u671f\u7684\u66f4\u591a\u4fe1\u606f\uff1a<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/cn\/r-\u65e5\u671f\u683c\u5f0f\/\" target=\"_blank\" rel=\"noopener\">R \u4e2d\u65e5\u671f\u683c\u5f0f\u7684\u5b8c\u6574\u6307\u5357<\/a><br \/> <a href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u6309\u65e5\u671f\u6392\u5e8f\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728 R \u4e2d\u6309\u65e5\u671f\u5bf9\u6570\u636e\u6846\u8fdb\u884c\u6392\u5e8f<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u4ece-r-\u4e2d\u7684\u65e5\u671f\u4e2d\u63d0\u53d6\u5e74\u4efd\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u4eceR\u4e2d\u7684\u65e5\u671f\u4e2d\u63d0\u53d6\u5e74\u4efd<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u5e38\uff0c\u5f53\u60a8\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u6570\u636e\u5bfc\u5165\u5230 R \u4e2d\u65f6\uff0c\u8fd9\u4e9b\u503c\u5c06\u4f5c\u4e3a\u5b57\u7b26\u4e32\u5bfc\u5165\u3002 \u5728 R \u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u7684\u6700\u7b80\u5355\u65b9\u6cd5 [&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-1184","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\u5728 R \u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\uff08\u9644\u793a\u4f8b\uff09<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u3002\" \/>\n<meta name=\"robots\" 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