{"id":463,"date":"2023-07-29T19:58:01","date_gmt":"2023-07-29T19:58:01","guid":{"rendered":"https:\/\/statorials.org\/ja\/r-%e3%81%a6%e3%82%99%e3%83%86%e3%82%99%e3%83%bc%e3%82%bf-%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e5%88%97%e3%81%ae%e5%90%8d%e5%89%8d%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2023-07-29T19:58:01","modified_gmt":"2023-07-29T19:58:01","slug":"r-%e3%81%a6%e3%82%99%e3%83%86%e3%82%99%e3%83%bc%e3%82%bf-%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e5%88%97%e3%81%ae%e5%90%8d%e5%89%8d%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/statorials.org\/ja\/r-%e3%81%a6%e3%82%99%e3%83%86%e3%82%99%e3%83%bc%e3%82%bf-%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e5%88%97%e3%81%ae%e5%90%8d%e5%89%8d%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"R \u3067\u30c7\u30fc\u30bf \u30d5\u30ec\u30fc\u30e0\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

<\/p>\n

\n

\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u4f7f\u7528\u3057\u3066 R \u3067\u30c7\u30fc\u30bf \u30d5\u30ec\u30fc\u30e0\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/span><\/p>\n

\u3053\u308c\u3089\u306e\u5404\u4f8b\u3067\u306f\u3001R \u306emtcars<\/strong>\u7d44\u307f\u8fbc\u307f\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/span><\/p>\n

Base R \u3092\u4f7f\u7528\u3057\u3066\u6700\u521d\u306en<\/em>\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3057\u307e\u3059<\/span><\/strong><\/h2>\n

mtcars\u306b\u306f\u5408\u8a08 11 \u500b\u306e\u5217\u540d\u304c\u3042\u308a\u307e\u3059<\/span>\u3002<\/span><\/strong><\/p>\n

 #view column names of mtcars<\/span>\nnames(mtcars)\n\n# [1] \"mpg\" \"cyl\" \"disp\" \"hp\" \"drat\" \"wt\" \"qsec\" \"vs\" \"am\" \"gear\"\n# [11] \u201ccarb\u201d<\/strong><\/pre>\n
\u6700\u521d\u306e 4 \u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u69cb\u6587\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n
 #rename first 4 columns<\/span>\nnames(mtcars) <- c(\"miles_gallon\", \"cylinders\", \"display\", \"horsepower\")\nnames(mtcars)\n\n#[1] \"miles_gallon\" \"cylinders\" \"display\" \"horsepower\" NA \n#[6] NA NA NA NA NA \n#[11] NA<\/strong><\/pre>\n
 R \u306f\u6700\u521d\u306e\u5217\u306e\u540d\u524d\u304b\u3089\u59cb\u307e\u308a\u3001\u6307\u5b9a\u3057\u305f\u6570\u3060\u3051\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001\u5217\u540d\u304c 11 \u500b\u3042\u308a\u3001\u5217\u540d\u306f 4 \u3064\u3060\u3051\u6307\u5b9a\u3057\u305f\u305f\u3081\u3001\u6700\u521d\u306e 4 \u5217\u306e\u307f\u304c\u540d\u524d\u5909\u66f4\u3055\u308c\u307e\u3057\u305f\u3002 11 \u5217\u3059\u3079\u3066\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u306b\u306f\u300111 \u5217\u540d\u306e\u30d9\u30af\u30c8\u30eb\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n
\u540d\u524d\u306e\u5909\u66f4 <\/em> Base R \u3092\u4f7f\u7528\u3057\u305f\u540d\u524d\u306b\u3088\u308b\u5217<\/span><\/strong><\/h2>\n
mtcars<\/strong>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u5185\u306e\u7279\u5b9a\u306e\u5217 (\u300cwt\u300d\u5217\u306a\u3069) \u306e\u540d\u524d\u3092\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u540d\u524d\u3067\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n
 #rename just the \"wt\" column in mtcars<\/span>\nnames(mtcars)[names(mtcars)==\"wt\"] <- \"weight\"\nnames(mtcars)\n\n#[1] \"mpg\" \"cyl\" \"disp\" \"hp\" \"drat\" \"weight\" \"qsec\" \"vs\" \n#[9] \"am\" \"gear\" \"carb\"<\/strong><\/pre>\n
 \u300cweight\u300d\u5217\u306e\u307f\u304c\u300cweight\u300d\u306b\u540d\u524d\u5909\u66f4\u3055\u308c\u3001\u4ed6\u306e\u5217\u306f\u3059\u3079\u3066\u5143\u306e\u540d\u524d\u304c\u7dad\u6301\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n
\u540d\u524d\u306e\u5909\u66f4 <\/em> Base R \u3092\u4f7f\u7528\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u308b\u5217<\/span><\/strong><\/h2>\n
mtcars<\/strong>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u5185\u306e\u7279\u5b9a\u306e\u5217\u306e\u540d\u524d\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u3063\u3066\u5909\u66f4\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u30012 \u756a\u76ee\u306e\u5217\u300ccyl\u300d\u306e\u540d\u524d\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u3063\u3066\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/span><\/p>\n
 #rename the second column name in mtcars<\/span>\nnames(mtcars)[2] <- \"cylinders\"\nnames(mtcars)\n\n# [1] \"mpg\" \"cylinders\" \"disp\" \"hp\" \"drat\" \"wt\" \n# [7] \"qsec\" \"vs\" \"am\" \"gear\" \"carb\"<\/strong><\/pre>\n
 \u300ccyl\u300d\u5217\u306e\u307f\u304c\u300ccylinder\u300d\u306b\u540d\u524d\u5909\u66f4\u3055\u308c\u3001\u4ed6\u306e\u3059\u3079\u3066\u306e\u5217\u306f\u5143\u306e\u540d\u524d\u304c\u7dad\u6301\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n
\u540d\u524d\u306e\u5909\u66f4 <\/em> dplyr\u3092\u4f7f\u7528\u3057\u305f\u5217<\/span><\/strong><\/h2>\n
R \u3067\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u3082\u3046 1 \u3064\u306e\u65b9\u6cd5\u306f\u3001 dplyr<\/strong>\u30d1\u30c3\u30b1\u30fc\u30b8\u306erename()<\/strong>\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u3092\u884c\u3046\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/span><\/p>\n
 data %>% rename(new_name1 = old_name1, new_name2 = old_name2, ....)<\/strong><\/pre>\n
\u305f\u3068\u3048\u3070\u3001 mtcars<\/strong>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u5217\u540d\u300cmpg\u300d\u3068\u300ccyl\u300d\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/span><\/p>\n
 #install (if not already installed) and load dplyr package<\/span>\nif(!require(dplyr)){install.packages('dplyr')}\n\n#rename the \"mpg\" and \"cyl\" columns\n<\/span>new_mtcars <- mtcars %>% \n                rename(\n                  miles_g = mpg,\n                  cylinder = cyl\n                  )\n\n#view new column names\n<\/span>names(new_mtcars)\n\n# [1] \"miles_g\" \"cylinder\" \"disp\" \"hp\" \"drat\" \"wt\" \n# [7] \"qsec\" \"vs\" \"am\" \"gear\" \"carb\"<\/strong><\/pre>\n
\u3053\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5fc5\u8981\u306a\u6570\u306e\u5217\u306e\u540d\u524d\u3092\u4e00\u5ea6\u306b\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n
\u540d\u524d\u306e\u5909\u66f4 <\/em> data.table\u3092\u4f7f\u7528\u3059\u308b\u5217<\/span><\/strong><\/h2>\n
R \u3067\u5217\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u3082\u3046 1 \u3064\u306e\u65b9\u6cd5\u306f\u3001 data.table<\/b>\u30d1\u30c3\u30b1\u30fc\u30b8\u306esetnames()<\/strong>\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u3092\u884c\u3046\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/span><\/p>\n
 setnames(data, old=c(\"old_name1\",\"old_name2\"), new=c(\"new_name1\", \"new_name2\"))<\/strong><\/pre>\n
\u305f\u3068\u3048\u3070\u3001 mtcars<\/strong>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u5217\u540d\u300cmpg\u300d\u3068\u300ccyl\u300d\u306e\u540d\u524d\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/span><\/p>\n
 #install (if not already installed) and load data.table package\nif(!require(data.table)){install.packages('data.table')}<\/span>\n<\/span>\n#rename \"mpg\" and \"cyl\" column names in mtcars\n<\/span>setnames(mtcars, old=c(\"mpg\",\"cyl\"), new=c(\"miles_g\", \"cylinder\"))\n\n#view new column names\n<\/span>names(mtcars)\n\n#[1] \"miles_g\" \"cylinder\" \"disp\" \"hp\" \"drat\" \"wt\" \n#[7] \"qsec\" \"vs\" \"am\" \"gear\" \"carb\"<\/strong><\/pre>\n
\u3053\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5fc5\u8981\u306a\u6570\u306e\u5217\u306e\u540d\u524d\u3092\u4e00\u5ea6\u306b\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
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