{"id":3224,"date":"2023-07-18T14:39:02","date_gmt":"2023-07-18T14:39:02","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e6%88%91%e5%ae%b3%e6%80%95\/"},"modified":"2023-07-18T14:39:02","modified_gmt":"2023-07-18T14:39:02","slug":"%e6%88%91%e5%ae%b3%e6%80%95","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e6%88%91%e5%ae%b3%e6%80%95\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u4f7f\u7528 fread() \u66f4\u5feb\u5730\u5bfc\u5165\u6587\u4ef6"},"content":{"rendered":"

<\/p>\n

\n

\u60a8\u53ef\u4ee5\u4f7f\u7528 R \u4e2ddata.table<\/strong>\u5305\u7684fread()<\/strong>\u51fd\u6570\u5feb\u901f\u8f7b\u677e\u5730\u5bfc\u5165\u6587\u4ef6\u3002<\/span><\/span><\/p>\n

\u8be5\u51fd\u6570\u4f7f\u7528\u4ee5\u4e0b\u57fa\u672c\u8bed\u6cd5\uff1a<\/span><\/p>\n

 library<\/span> (data.table)\n\ndf <- fread(\" C:\\\\Users\\\\Path\\\\To\\\\My\\\\data.csv<\/span> \")<\/strong><\/pre>\n
\u5bf9\u4e8e\u5927\u6587\u4ef6\uff0c\u6211\u4eec\u53d1\u73b0\u8be5\u51fd\u6570\u6bd4\u6765\u81ea R \u5e93\u7684read.csv<\/strong>\u7b49\u51fd\u6570\u8981\u5feb\u5f97\u591a\u3002<\/span><\/p>\n
\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6b64\u51fd\u6570\u8fd8\u53ef\u4ee5\u81ea\u52a8\u68c0\u6d4b\u60a8\u8981\u5bfc\u5165\u7684\u6570\u636e\u96c6\u7684\u5206\u9694\u7b26\u548c\u5217\u7c7b\u578b\u3002<\/span><\/p>\n
\u4e0b\u9762\u7684\u4f8b\u5b50\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u9645\u4e2d\u4f7f\u7528\u8fd9\u4e2a\u529f\u80fd\u3002<\/span><\/p>\n
\u793a\u4f8b\uff1a\u5982\u4f55\u4f7f\u7528 feed() \u5c06\u6587\u4ef6\u5bfc\u5165\u5230 R \u4e2d<\/strong><\/span><\/h3>\n
\u5047\u8bbe\u6211\u6709\u4e00\u4e2a\u540d\u4e3adata.csv<\/strong>\u7684 CSV \u6587\u4ef6\u4fdd\u5b58\u5728\u4ee5\u4e0b\u4f4d\u7f6e\uff1a<\/span><\/p>\n
 C:\\Users\\Bob\\Desktop\\data.csv<\/strong><\/span><\/p>\n
\u5e76\u5047\u8bbe CSV \u6587\u4ef6\u5305\u542b\u4ee5\u4e0b\u6570\u636e\uff1a<\/span><\/p>\n
 team, points, assists\n'A', 78, 12\n'B', 85, 20\n'C', 93, 23\n'D', 90, 8\n'E', 91, 14\n<\/strong><\/pre>\n
\u6211\u53ef\u4ee5\u4f7f\u7528data.table<\/strong>\u5305\u7684fread()<\/strong>\u51fd\u6570\u5c06\u6b64\u6587\u4ef6\u5bfc\u5165\u5230\u6211\u5f53\u524d\u7684 R \u73af\u5883\u4e2d\uff1a<\/span><\/span><\/p>\n
 library<\/span> (data.table)<\/span>\n\n#import data<\/span>\ndf <- fread(\"C:\\Users\\Bob\\Desktop\\data.csv\")\n<\/span>\n#viewdata\n<\/span>df\n\n  team points assists\n1 A 78 12\n2 B 85 20\n3 C 93 23\n4 D 90 8\n5 E 91 14<\/strong><\/pre>\n
\u6211\u4eec\u80fd\u591f\u4f7f\u7528fread()<\/strong>\u51fd\u6570\u6210\u529f\u5bfc\u5165 CSV \u6587\u4ef6\u3002<\/span><\/p>\n
\u6ce8\u610f<\/strong>\uff1a\u6211\u4eec\u5728\u6587\u4ef6\u8def\u5f84\u4e2d\u4f7f\u7528\u53cc\u53cd\u659c\u6760 (\\\\) \u4ee5\u907f\u514d\u5e38\u89c1\u7684\u5bfc\u5165\u9519\u8bef<\/a>\u3002<\/span><\/p>\n
\u8bf7\u6ce8\u610f\uff0c\u6211\u4eec\u4e5f\u4e0d\u9700\u8981\u6307\u5b9a\u5206\u9694\u7b26\uff0c\u56e0\u4e3afread()<\/strong>\u51fd\u6570\u81ea\u52a8\u68c0\u6d4b\u5230\u5b83\u662f\u9017\u53f7\u3002<\/span><\/p>\n
\u5982\u679c\u6211\u4eec\u4f7f\u7528str()<\/a>\u51fd\u6570\u663e\u793a\u6570\u636e\u6846\u7684\u7ed3\u6784\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230fread()<\/strong>\u51fd\u6570\u4e5f\u81ea\u52a8\u8bc6\u522b\u4e86\u6bcf\u4e00\u5217\u7684\u5bf9\u8c61\u7c7b\u578b\uff1a<\/span><\/p>\n
 #view structure of data\n<\/span>str(df)\n\nClasses 'data.table' and 'data.frame': 5 obs. of 3 variables:\n $ team: chr \"'A'\" \"'B'\" \"'C'\" \"'D'\" ...\n $points: int 78 85 93 90 91\n $assists: int 12 20 23 8 14\n<\/strong><\/pre>\n
\u4ece\u7ed3\u679c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff1a<\/span><\/p>\n