{"id":614,"date":"2023-11-19T09:18:50","date_gmt":"2022-12-24T22:19:11","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/r%e3%81%aemelt%e9%96%a2%e6%95%b0%e3%81%a8cast%e9%96%a2%e6%95%b0-r%e3%81%a7%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%86%8d%e6%a7%8b%e6%88%90%e3%81%99%e3%82%8b\/"},"modified":"2025-08-01T01:05:30","modified_gmt":"2025-07-31T16:05:30","slug":"r%e3%81%aemelt%e9%96%a2%e6%95%b0%e3%81%a8cast%e9%96%a2%e6%95%b0-r%e3%81%a7%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%86%8d%e6%a7%8b%e6%88%90%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/r%e3%81%aemelt%e9%96%a2%e6%95%b0%e3%81%a8cast%e9%96%a2%e6%95%b0-r%e3%81%a7%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%86%8d%e6%a7%8b%e6%88%90%e3%81%99%e3%82%8b\/","title":{"rendered":"R\u306emelt()\u95a2\u6570\u3068cast()\u95a2\u6570 – R\u3067\u30c7\u30fc\u30bf\u3092\u518d\u69cb\u6210\u3059\u308b"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\u3001\u8aad\u8005\u306e\u7686\u3055\u3093\uff01\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001R\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3042\u308b\u300cR melt()\u300d\u3068\u300ccast()\u300d\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u30c7\u30fc\u30bf\u306e\u30ea\u30b7\u30a7\u30a4\u30d7\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

R\u306emelt()\u95a2\u6570\u3068cast()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u5185\u306e\u30c7\u30fc\u30bf\u3092\u4efb\u610f\u306e\u5f62\u72b6\u306b\u518d\u69cb\u7bc9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\n

R\u306emelt()\u3068cast()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u4f5c\u696d\u3057\u307e\u3059\u3002<\/h2>\n

\u8a73\u7d30\u306b\u4e21\u6a5f\u80fd\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u3055\u3042\u3001\u59cb\u3081\u307e\u3057\u3087\u3046\uff01<\/p>\n

I. R \u306e melt() \u95a2\u6570<\/h3>\n

R\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306emelt()\u95a2\u6570\u306f\u3001\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u3067\u3059\u3002\u3053\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u30e6\u30fc\u30b6\u30fc\u304c\u5b9a\u7fa9\u3057\u305f\u65b9\u6cd5\u3067\u518d\u5f62\u6210\u3057\u5ef6\u9577\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30fc\u30bf\u5024\u3092\u9577\u3044\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u5f62\u5f0f\u3067\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u306e\u69cb\u6587\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff01(Ike no k\u014dbun o goran kudasai!)<\/p>\n

\u6587\u6cd5:<\/p>\n

melt(<\/span>data-<\/span>frame,<\/span> na.rm =<\/span> FALSE<\/span>,<\/span> value.name =<\/span> \u201cname\u201d,<\/span> id =<\/span> 'columns'<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u79c1\u305f\u3061\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u3057\u3066na.rm = FALSE\u3092\u4f34\u3046\u95a2\u6570\u306b\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u6e21\u3059\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u518d\u5f62\u6210\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001NA\u306e\u5024\u304c\u7121\u8996\u3055\u308c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n
\u3055\u3089\u306b\u3001\u65b0\u3057\u3044\u5909\u6570\/\u5217\u540d\u3092value.name\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306b\u6e21\u3057\u3001\u95a2\u6570\u304b\u3089\u53d6\u5f97\u3057\u305f\u5ef6\u9577\u3055\u308c\u305f\u5024\u3092\u305d\u3053\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n
ID\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3001\u518d\u5f62\u6210\u304c\u884c\u308f\u308c\u308b\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306e\u5217\u540d\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u8cea\u554f\uff1a\u300c\u3042\u306a\u305f\u306e\u8da3\u5473\u306f\u4f55\u3067\u3059\u304b\uff1f\u300d<\/p>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u300cMASS\u3001reshape2\u3001\u304a\u3088\u3073reshape\u300d\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u4f5c\u6210\u3057\u305f\u3089\u3001\u5217A\u3068B\u306b\u95a2\u3057\u3066\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306bmelt()\u95a2\u6570\u3092\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\n
rm(<\/span>list =<\/span> ls(<\/span>)<\/span>)<\/span>\r\n\r\ninstall.packages(<\/span>\"MASS\"<\/span>)<\/span> \r\ninstall.packages(<\/span>\"reshape2\"<\/span>)<\/span> \r\ninstall.packages(<\/span>\"reshape\"<\/span>)<\/span> \r\n\r\nlibrary(<\/span>MASS)<\/span> \r\nlibrary(<\/span>reshape2)<\/span> \r\nlibrary(<\/span>reshape)<\/span> \r\n\r\n \r\nA <-<\/span> c(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>1<\/span>)<\/span> \r\nB <-<\/span> c(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>1<\/span>)<\/span> \r\na <-<\/span> c(<\/span>10<\/span>,<\/span>20<\/span>,<\/span>30<\/span>,<\/span>40<\/span>,<\/span>50<\/span>,<\/span>60<\/span>,<\/span>70<\/span>,<\/span>80<\/span>)<\/span> \r\nb <-<\/span> c(<\/span>100<\/span>,<\/span>200<\/span>,<\/span>300<\/span>,<\/span>400<\/span>,<\/span>500<\/span>,<\/span>600<\/span>,<\/span>700<\/span>,<\/span>800<\/span>)<\/span> \r\ndata <-<\/span> data.frame(<\/span>A,<\/span>B,<\/span>a,<\/span>b)<\/span> \r\n\r\nprint(<\/span>\"Original data frame:\\n\"<\/span>)<\/span> \r\nprint(<\/span>data)<\/span> \r\n\r\nmelt_data <-<\/span> melt(<\/span>data,<\/span> id =<\/span> c(<\/span>\"A\"<\/span>,<\/span>\"B\"<\/span>)<\/span>)<\/span> \r\n\r\nprint(<\/span>\"Reshaped data frame:\\n\"<\/span>)<\/span> \r\nprint(<\/span>melt_data)<\/span> \r\n   \r\n<\/code><\/pre>\n
\u51fa\u529b:<\/p>\n
[<\/span>1<\/span>]<\/span> \"Original data frame:\\n\"<\/span>\r\n  A B  a   b\r\n1<\/span> 1<\/span> 1<\/span> 10<\/span> 100<\/span>\r\n2<\/span> 2<\/span> 2<\/span> 20<\/span> 200<\/span>\r\n3<\/span> 3<\/span> 3<\/span> 30<\/span> 300<\/span>\r\n4<\/span> 4<\/span> 4<\/span> 40<\/span> 400<\/span>\r\n5<\/span> 2<\/span> 2<\/span> 50<\/span> 500<\/span>\r\n6<\/span> 3<\/span> 3<\/span> 60<\/span> 600<\/span>\r\n7<\/span> 4<\/span> 4<\/span> 70<\/span> 700<\/span>\r\n8<\/span> 1<\/span> 1<\/span> 80<\/span> 800<\/span>\r\n\r\n[<\/span>1<\/span>]<\/span> \"Reshaped data frame:\\n\"<\/span>\r\n><\/span> print(<\/span>melt_data)<\/span> \r\n   A B variable value\r\n1<\/span>  1<\/span> 1<\/span>        a    10<\/span>\r\n2<\/span>  2<\/span> 2<\/span>        a    20<\/span>\r\n3<\/span>  3<\/span> 3<\/span>        a    30<\/span>\r\n4<\/span>  4<\/span> 4<\/span>        a    40<\/span>\r\n5<\/span>  2<\/span> 2<\/span>        a    50<\/span>\r\n6<\/span>  3<\/span> 3<\/span>        a    60<\/span>\r\n7<\/span>  4<\/span> 4<\/span>        a    70<\/span>\r\n8<\/span>  1<\/span> 1<\/span>        a    80<\/span>\r\n9<\/span>  1<\/span> 1<\/span>        b   100<\/span>\r\n10<\/span> 2<\/span> 2<\/span>        b   200<\/span>\r\n11<\/span> 3<\/span> 3<\/span>        b   300<\/span>\r\n12<\/span> 4<\/span> 4<\/span>        b   400<\/span>\r\n13<\/span> 2<\/span> 2<\/span>        b   500<\/span>\r\n14<\/span> 3<\/span> 3<\/span>        b   600<\/span>\r\n15<\/span> 4<\/span> 4<\/span>        b   700<\/span>\r\n16<\/span> 1<\/span> 1<\/span>        b   800<\/span>\r\n<\/code><\/pre>\n
\n
II. R\u306ecast()\u95a2\u6570<\/h3>\n
II. R\u306ecast()\u95a2\u6570\u3092\u30d1\u30e9\u30d5\u30ec\u30fc\u30ba\u3059\u308b\u306a\u3089\u3070\u3001<\/p>\n
\u4e0a\u8ff0\u306e\u901a\u308a\u3001melt()\u95a2\u6570\u3092\u9069\u7528\u3057\u305f\u5f8c\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306f\u5c55\u958b\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u307b\u307c\u5143\u306e\u81ea\u7136\u306a\u5f62\u306b\u623b\u3059\u305f\u3081\u306b\u3001R\u306ecast()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
cast()\u95a2\u6570\u306f\u3001\u96c6\u8a08\u95a2\u6570\u3068\u5f0f\u3092\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u307e\u3059\uff08\u3053\u3053\u3067\u3001\u5f0f\u306f\u30c7\u30fc\u30bf\u3092\u518d\u5f62\u6210\u3057\u305f\u5f8c\u306e\u8868\u73fe\u65b9\u6cd5\u3067\u3059\uff09\u3002\u305d\u3057\u3066\u3001\u4f38\u9577\u307e\u305f\u306f\u591a\u91cd\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u3001\u307b\u307c\u96c6\u8a08\u3055\u308c\u305f\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u30ad\u30e3\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n
\u6587\u6cd5\uff1a<\/p>\n
cast(<\/span>data,<\/span> formula,<\/span> aggregate function<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u79c1\u305f\u3061\u306f\u3001mean\u3001sum\u306a\u3069\u306e\u5229\u7528\u53ef\u80fd\u306a\u96c6\u8a08\u95a2\u6570\u3092cast()\u95a2\u6570\u306b\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Note: It is difficult to provide a single option as the Japanese language allows for multiple ways to express the same meaning. Here is one possible paraphrase:<\/p>\n
\u539f\u6587\uff1a “He enjoys playing basketball every Sunday with his friends.”
\n\u65e5\u672c\u8a9e\u8a33\uff1a \u5f7c\u306f\u6bce\u9031\u65e5\u66dc\u65e5\u306b\u53cb\u9054\u3068\u30d0\u30b9\u30b1\u30c3\u30c8\u30dc\u30fc\u30eb\u3092\u697d\u3057\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n
rm(<\/span>list =<\/span> ls(<\/span>)<\/span>)<\/span>\r\n\r\nlibrary(<\/span>MASS)<\/span> \r\nlibrary(<\/span>reshape2)<\/span> \r\nlibrary(<\/span>reshape)<\/span> \r\n\r\nA <-<\/span> c(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>1<\/span>)<\/span> \r\nB <-<\/span> c(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>1<\/span>)<\/span> \r\na <-<\/span> c(<\/span>10<\/span>,<\/span>20<\/span>,<\/span>30<\/span>,<\/span>40<\/span>,<\/span>50<\/span>,<\/span>60<\/span>,<\/span>70<\/span>,<\/span>80<\/span>)<\/span> \r\nb <-<\/span> c(<\/span>100<\/span>,<\/span>200<\/span>,<\/span>300<\/span>,<\/span>400<\/span>,<\/span>500<\/span>,<\/span>600<\/span>,<\/span>700<\/span>,<\/span>800<\/span>)<\/span> \r\ndata <-<\/span> data.frame(<\/span>A,<\/span>B,<\/span>a,<\/span>b)<\/span> \r\n\r\nprint(<\/span>\"Original data frame:\\n\"<\/span>)<\/span> \r\nprint(<\/span>data)<\/span> \r\n\r\nmelt_data <-<\/span> melt(<\/span>data,<\/span> id =<\/span> c(<\/span>\"A\"<\/span>)<\/span>)<\/span> \r\n\r\nprint(<\/span>\"Reshaped data frame after melting:\\n\"<\/span>)<\/span> \r\nprint(<\/span>melt_data)<\/span>\r\n\r\ncast_data =<\/span> cast(<\/span>melt_data,<\/span> A~<\/span>variable,<\/span> mean)<\/span> \r\n\r\nprint(<\/span>\"Reshaped data frame after casting:\\n\"<\/span>)<\/span> \r\nprint(<\/span>cast_data)<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u901a\u308a\u3001\u79c1\u305f\u3061\u306fcast()\u306bmean\u3092\u96c6\u8a08\u95a2\u6570\u3068\u3057\u3066\u6e21\u3057\u3001\u5909\u6570\u3092A\u5909\u6570\u3068\u540c\u3058\u8868\u73fe\u5f62\u5f0f\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u51fa\u529b:<\/p>\n
[<\/span>1<\/span>]<\/span> \"Original data frame:\\n\"<\/span>\r\n  A B  a   b\r\n1<\/span> 1<\/span> 1<\/span> 10<\/span> 100<\/span>\r\n2<\/span> 2<\/span> 2<\/span> 20<\/span> 200<\/span>\r\n3<\/span> 3<\/span> 3<\/span> 30<\/span> 300<\/span>\r\n4<\/span> 4<\/span> 4<\/span> 40<\/span> 400<\/span>\r\n5<\/span> 2<\/span> 2<\/span> 50<\/span> 500<\/span>\r\n6<\/span> 3<\/span> 3<\/span> 60<\/span> 600<\/span>\r\n7<\/span> 4<\/span> 4<\/span> 70<\/span> 700<\/span>\r\n8<\/span> 1<\/span> 1<\/span> 80<\/span> 800<\/span>\r\n\r\n[<\/span>1<\/span>]<\/span> \"Reshaped data frame after melting:\\n\"<\/span>\r\n   A variable value\r\n1<\/span>  1<\/span>        B     1<\/span>\r\n2<\/span>  2<\/span>        B     2<\/span>\r\n3<\/span>  3<\/span>        B     3<\/span>\r\n4<\/span>  4<\/span>        B     4<\/span>\r\n5<\/span>  2<\/span>        B     2<\/span>\r\n6<\/span>  3<\/span>        B     3<\/span>\r\n7<\/span>  4<\/span>        B     4<\/span>\r\n8<\/span>  1<\/span>        B     1<\/span>\r\n9<\/span>  1<\/span>        a    10<\/span>\r\n10<\/span> 2<\/span>        a    20<\/span>\r\n11<\/span> 3<\/span>        a    30<\/span>\r\n12<\/span> 4<\/span>        a    40<\/span>\r\n13<\/span> 2<\/span>        a    50<\/span>\r\n14<\/span> 3<\/span>        a    60<\/span>\r\n15<\/span> 4<\/span>        a    70<\/span>\r\n16<\/span> 1<\/span>        a    80<\/span>\r\n17<\/span> 1<\/span>        b   100<\/span>\r\n18<\/span> 2<\/span>        b   200<\/span>\r\n19<\/span> 3<\/span>        b   300<\/span>\r\n20<\/span> 4<\/span>        b   400<\/span>\r\n21<\/span> 2<\/span>        b   500<\/span>\r\n22<\/span> 3<\/span>        b   600<\/span>\r\n23<\/span> 4<\/span>        b   700<\/span>\r\n24<\/span> 1<\/span>        b   800<\/span>\r\n\r\n[<\/span>1<\/span>]<\/span> \"Reshaped data frame after casting:\\n\"<\/span>\r\n  A B  a   b\r\n1<\/span> 1<\/span> 1<\/span> 45<\/span> 450<\/span>\r\n2<\/span> 2<\/span> 2<\/span> 35<\/span> 350<\/span>\r\n3<\/span> 3<\/span> 3<\/span> 45<\/span> 450<\/span>\r\n4<\/span> 4<\/span> 4<\/span> 55<\/span> 550<\/span>\r\n<\/code><\/pre>\n
\n
\u7d50\u8ad6<\/h2>\n
\u3053\u308c\u306b\u3088\u308a\u3001\u3053\u306e\u30c8\u30d4\u30c3\u30af\u306f\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002\u3082\u3057\u3054\u8cea\u554f\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u4e0b\u306b\u30b3\u30e1\u30f3\u30c8\u3057\u3066\u81ea\u7531\u306b\u304a\u66f8\u304d\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u305d\u308c\u307e\u3067\u3001\u5b66\u3073\u3092\u697d\u3057\u3093\u3067\u304f\u3060\u3055\u3044\uff01:)<\/p>\n
\u53c2\u8003\u6587\u732e\uff1a<\/p>\n
    \n
  • https:\/\/www.rdocumentation.org\/packages\/reshape2\/versions\/1.4.4\/topics\/melt<\/li>\n
  • https:\/\/www.rdocumentation.org\/packages\/reshape2\/versions\/1.4.4\/topics\/cast<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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