{"id":3100,"date":"2023-07-19T05:30:35","date_gmt":"2023-07-19T05:30:35","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e9%94%99%e8%af%af-%e5%bf%85%e9%a1%bb%e6%8f%90%e4%be%9b%e5%8e%9f%e4%ba%a7%e5%9c%b0%e6%97%a5%e6%9c%9f\/"},"modified":"2023-07-19T05:30:35","modified_gmt":"2023-07-19T05:30:35","slug":"r-%e9%94%99%e8%af%af-%e5%bf%85%e9%a1%bb%e6%8f%90%e4%be%9b%e5%8e%9f%e4%ba%a7%e5%9c%b0%e6%97%a5%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e9%94%99%e8%af%af-%e5%bf%85%e9%a1%bb%e6%8f%90%e4%be%9b%e5%8e%9f%e4%ba%a7%e5%9c%b0%e6%97%a5%e6%9c%9f\/","title":{"rendered":"\u5982\u4f55\u4fee\u590d r: as.date.numeric(x) \u4e2d\u7684\u9519\u8bef\uff1a\u5fc5\u987b\u63d0\u4f9b\u201corigin\u201d"},"content":{"rendered":"

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\u5728 R \u4e2d\u60a8\u53ef\u80fd\u9047\u5230\u7684\u9519\u8bef\u662f\uff1a<\/span><\/p>\n

 Error in as.Date.numeric(x) : 'origin' must be supplied \n<\/strong><\/pre>\n
\u5f53\u60a8\u5c1d\u8bd5\u5c06\u6570\u5b57\u8f6c\u6362\u4e3a R \u4e2d\u7684\u65e5\u671f\u4f46\u65e0\u6cd5\u63d0\u4f9b\u539f\u59cb\u65e5\u671f\u65f6\uff0c\u901a\u5e38\u4f1a\u53d1\u751f\u6b64\u9519\u8bef\u3002<\/span><\/p>\n
\u672c\u6559\u7a0b\u51c6\u786e\u89e3\u91ca\u4e86\u5982\u4f55\u4fee\u590d\u6b64\u9519\u8bef\u3002<\/span><\/p>\n
\u5982\u4f55\u91cd\u73b0\u9519\u8bef<\/strong><\/h3>\n
\u5047\u8bbe\u6211\u4eec\u5728 R \u4e2d\u6709\u4ee5\u4e0b\u6570\u636e\u6846\uff0c\u663e\u793a\u4e00\u5bb6\u516c\u53f8\u51e0\u5929\u5185\u7684\u603b\u9500\u552e\u989d\uff1a<\/span><\/p>\n
 #create data frame\ndf <- data. frame<\/span> (date=c(27, 140, 180, 200),\n                 sales=c(12, 22, 30, 31))<\/span>\n\n#view data frame\ndf\n\n  dirty dates\n1 27 12\n2 140 22\n3 180 30\n4,200 31<\/span><\/span><\/strong><\/span><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528str()<\/a>\u51fd\u6570\u6765\u663e\u793a\u6570\u636e\u6846\u7684\u7ed3\u6784\uff1a<\/span><\/p>\n
 #view structure of data frame<\/strong><\/span>\nstr(df)\n\n'data.frame': 4 obs. of 2 variables:\n $ date: num 27 140 180 200\n $ sales: num 12 22 30 31\n<\/strong><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u65e5\u671f<\/strong>\u548c\u9500\u552e\u989d<\/strong>\u5217\u90fd\u662f\u6570\u5b57\u3002<\/span><\/p>\n
\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u5c1d\u8bd5\u5c06\u65e5\u671f<\/strong>\u5217\u8f6c\u6362\u4e3a\u65e5\u671f\u683c\u5f0f\uff1a<\/span><\/p>\n
 #attempt to convert date column to date format<\/strong><\/span>\ndf$date <- as. Date<\/span> (df$date)\n\nError in as.Date.numeric(df$date) : 'origin' must be supplied\n<\/strong><\/span><\/pre>\n
\u6211\u4eec\u6536\u5230\u9519\u8bef\uff0c\u56e0\u4e3a\u6211\u4eec\u6ca1\u6709\u5728as.Date()<\/strong>\u51fd\u6570\u4e2d\u4f7f\u7528origin<\/strong>\u53c2\u6570\u3002<\/span><\/p>\n
\u5982\u4f55\u4fee\u590d\u9519\u8bef<\/strong><\/span><\/h3>\n
\u4fee\u590d\u6b64\u9519\u8bef\u7684\u65b9\u6cd5\u662f\u7b80\u5355\u5730\u63d0\u4f9b\u539f\u59cb\u65e5\u671f\uff0c\u4ee5\u4fbf R \u77e5\u9053\u5982\u4f55\u5c06\u6570\u5b57\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/span><\/p>\n
 #convert date column to date format, using 2020-01-01 as origin date\ndf$date <- as. Date<\/span> (df$date, origin=\" 2020-01-01<\/span> \")\n\n#view updated data frame\n<\/span>df\n\n        dirty dates\n1 2020-01-28 12\n2 2020-05-20 22\n3 2020-06-29 30\n4 2020-07-19 31<\/span><\/span><\/strong><\/span><\/pre>\n
\u901a\u8fc7\u63d0\u4f9b\u8d77\u59cb\u65e5\u671f\uff0cR \u901a\u8fc7\u5c06\u5929\u6570\u6dfb\u52a0\u5230\u63d0\u4f9b\u7684\u8d77\u59cb\u65e5\u671f\uff0c\u5c06\u6570\u5b57\u8f6c\u6362\u4e3a\u65e5\u671f\u3002<\/span><\/p>\n
\u4f8b\u5982\uff1a<\/span><\/p>\n