{"id":3961,"date":"2023-07-14T12:18:32","date_gmt":"2023-07-14T12:18:32","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e6%b6%a6%e6%bb%91%e8%af%a5%e6%9c%88%e7%9a%84%e7%ac%ac%e4%b8%80%e5%a4%a9%e5%92%8c%e6%9c%80%e5%90%8e%e4%b8%80%e5%a4%a9\/"},"modified":"2023-07-14T12:18:32","modified_gmt":"2023-07-14T12:18:32","slug":"%e6%b6%a6%e6%bb%91%e8%af%a5%e6%9c%88%e7%9a%84%e7%ac%ac%e4%b8%80%e5%a4%a9%e5%92%8c%e6%9c%80%e5%90%8e%e4%b8%80%e5%a4%a9","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e6%b6%a6%e6%bb%91%e8%af%a5%e6%9c%88%e7%9a%84%e7%ac%ac%e4%b8%80%e5%a4%a9%e5%92%8c%e6%9c%80%e5%90%8e%e4%b8%80%e5%a4%a9\/","title":{"rendered":"A\uff1a\u5982\u4f55\u4f7f\u7528 lubridate \u83b7\u53d6\u8be5\u6708\u7684\u7b2c\u4e00\u5929\u6216\u6700\u540e\u4e00\u5929"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u4f7f\u7528<a href=\"https:\/\/lubridate.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">lubridate<\/a>\u5305\u4e2d\u7684\u51fd\u6570\u83b7\u53d6 R \u4e2d\u65e5\u671f\u7684\u8be5\u6708\u7684\u7b2c\u4e00\u5929\u6216\u6700\u540e\u4e00\u5929\uff1a<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u65b9\u6cd5\u4e00\uff1a\u83b7\u53d6\u8be5\u6708\u7684\u7b2c\u4e00\u5929<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (lubridate)<\/strong>\n<strong>\n<span style=\"color: #000000;\">df$first_day &lt;- floor_date(ymd(df$date), ' <span style=\"color: #ff0000;\">month<\/span> ')\n<\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\"><strong>\u65b9\u6cd52\uff1a\u83b7\u53d6\u8be5\u6708\u7684\u6700\u540e\u4e00\u5929<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (lubridate)\n\ndf$last_day &lt;- ceiling_date(ymd(df$date), ' <span style=\"color: #ff0000;\">month<\/span> ') - days( <span style=\"color: #008000;\">1<\/span> )\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u6570\u636e\u6846\u4f7f\u7528\u6bcf\u79cd\u65b9\u6cd5\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (date=c('2022-01-05', '2022-02-18', '2022-03-21',\n                        '2022-09-15', '2022-10-30', '2022-12-25'),\n                 sales=c(14, 29, 25, 23, 39, 46))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n        dirty date\n1 2022-01-05 14\n2 2022-02-18 29\n3 2022-03-21 25\n4 2022-09-15 23\n5 2022-10-30 39\n6 2022-12-25 46\n<\/strong><\/pre>\n<h2><span style=\"color: #000000;\"><strong>\u793a\u4f8b 1\uff1a\u4f7f\u7528 Lubricant \u83b7\u53d6\u8be5\u6708\u7684\u7b2c\u4e00\u5929<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u4f7f\u7528 lubridate \u5305\u7684<strong>Floor_date()<\/strong>\u51fd\u6570\u83b7\u53d6<strong>\u65e5\u671f<\/strong>\u5217\u4e2d\u6bcf\u4e2a\u503c\u7684\u8be5\u6708\u7684\u7b2c\u4e00\u5929\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;\">#add new column that contains first day of month\n<\/span>df$first_day &lt;- floor_date(ymd(df$date), ' <span style=\"color: #ff0000;\">month<\/span> ')\n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n        date sales first_day\n1 2022-01-05 14 2022-01-01\n2 2022-02-18 29 2022-02-01\n3 2022-03-21 25 2022-03-01\n4 2022-09-15 23 2022-09-01\n5 2022-10-30 39 2022-10-01\n6 2022-12-25 46 2022-12-01\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0c\u65b0\u7684<b>first_day<\/b>\u5217\u4e2d\u7684\u503c\u5305\u542b<strong>\u65e5\u671f<\/strong>\u5217\u4e2d\u6bcf\u4e2a\u503c\u7684\u8be5\u6708\u7684\u7b2c\u4e00\u5929\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6ce8\u610f<\/strong>\uff1a\u6211\u4eec\u4f7f\u7528<strong>ymd()<\/strong>\u51fd\u6570\u9996\u5148\u5c06\u65e5\u671f\u5217\u4e2d\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u53ef\u8bc6\u522b\u7684\u65e5\u671f\u683c\u5f0f\u3002<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>\u793a\u4f8b 2\uff1a\u4f7f\u7528 Lubridate \u83b7\u53d6\u8be5\u6708\u7684\u6700\u540e\u4e00\u5929<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u4f7f\u7528 lubridate \u5305\u7684<strong>Ceiling_date()<\/strong>\u51fd\u6570\u83b7\u53d6<strong>\u65e5\u671f<\/strong>\u5217\u4e2d\u6bcf\u4e2a\u503c\u7684\u8be5\u6708\u7684\u6700\u540e\u4e00\u5929\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;\">#add new column that contains last day of month\n<\/span>df$last_day &lt;- ceiling_date(ymd(df$date), ' <span style=\"color: #ff0000;\">month<\/span> ') - days( <span style=\"color: #008000;\">1<\/span> )\n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n        date sales last_day\n1 2022-01-05 14 2022-01-31\n2 2022-02-18 29 2022-02-28\n3 2022-03-21 25 2022-03-31\n4 2022-09-15 23 2022-09-30\n5 2022-10-30 39 2022-10-31\n6 2022-12-25 46 2022-12-3122-12-01\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0c\u65b0\u7684<strong>last_day<\/strong>\u5217\u4e2d\u7684\u503c\u5305\u542b<strong>\u65e5\u671f<\/strong>\u5217\u4e2d\u6bcf\u4e2a\u503c\u8be5\u6708\u7684\u6700\u540e\u4e00\u5929\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6709\u5173\u66f4\u591a\u65e5\u671f\u683c\u5f0f\u9009\u9879\uff0c\u8bf7\u53c2\u9605 Lubridate<a href=\"https:\/\/lubridate.tidyverse.org\/reference\/ymd.html\" target=\"_blank\" rel=\"noopener\">\u6587\u6863\u9875\u9762<\/a>\u3002<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u5176\u4ed6\u5e38\u89c1\u4efb\u52a1\uff1a<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/cn\/r-\u5c06\u65e5\u671f\u8f6c\u6362\u4e3a\u6570\u5b57\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728R\u4e2d\u5c06\u65e5\u671f\u8f6c\u6362\u4e3a\u6570\u5b57<\/a><br \/> <a href=\"https:\/\/statorials.org\/cn\/\u4ece-r-\u4e2d\u7684\u65e5\u671f\u63d0\u53d6\u6708\u4efd\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u4eceR\u4e2d\u7684\u65e5\u671f\u4e2d\u63d0\u53d6\u6708\u4efd<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u4ece\u65e5\u671f-r-\u4e2d\u52a0\u51cf\u6708\u4efd\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 R \u4e2d\u4e3a\u65e5\u671f\u6dfb\u52a0\u548c\u51cf\u53bb\u6708\u4efd<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u4f7f\u7528lubridate\u5305\u4e2d\u7684\u51fd\u6570\u83b7\u53d6 R \u4e2d\u65e5\u671f\u7684\u8be5\u6708\u7684\u7b2c\u4e00\u5929\u6216\u6700\u540e\u4e00\u5929\uff1a \u65b9\u6cd5\u4e00\uff1a\u83b7\u53d6\u8be5\u6708 [&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-3961","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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