複数のファイルに対してstrsplit関数を適用する

Question

誰かが私のコードのステップ4で間違っていることを確認できますか（strsplit）？

私は、リストでそれらを読んで、名前を分割し、3を追加しようとしている3名の「101_E45_N66.csv」はディレクトリ内のファイル、「102_E46_N76.csv」、「103_E47_N86.csv」

を持っています

：= N936410

= E904690、「北距」「を偏東」は、例えば、各ファイルの新しいcoloumns、= 101「ID」は、私は次のように私がいる個々のファイルに対して実行できるかについての私の前の質問から知っています

filename <- '101_E45_N66.csv' 
    ## spliting name "101_E45_N66.csv" to create 3 new coloumn within dataframe 
      s = strsplit(filename,"_",,fixed=TRUE)[[1]] 
    df1= cbind(df[,c("type","date")],ID=s[1],name1=s[2],name2=s[3],df[,3:ncol(df)]) 

しかし、lisに適用するlapply関数を作成しようとしているとき私は間違って何をやっているのかわからないので、ファイル名の1つだけを使用し、3つのファイルすべてに同じ名前のcoloumnsを追加するように見えるので、ディレクトリにファイルを書き戻します（私のコードのステップ4を参照してください）私が使用しているコードは以下の通りです：

mycsv = dir(pattern=".csv") 

n <- length(mycsv) 

## step 1 - read file 
mylist <- vector("list", n) 

for(i in 1:n) mylist[[i]] <- read.csv(mycsv[i],header = TRUE,skip =5, nrow = length(count.fields(mycsv[i])) - 12) 

## step 2 - Change coloumn name 
mylist <- lapply(mylist, function(x) {names(x) <- c("type","date","v1","v2","v3","v4","v5","v6","v7") ; return(x)}) 

## step 3 - changing type coloumn for weekday/weekend 

mylist <- lapply(mylist, function(x) { 
    f = c("wd", "we", "we", "wd", "wd", "wd", "wd") 
    x$type = rep(f,52, length.out = 30) 
    return(x) 
}) 

## Step 4 - spliting filename to create 3 new coloumn within dataframe 

    mylist <- lapply(mylist, function(x) { 
      s = strsplit(mycsv[i],"_",,fixed=TRUE)[[1]] 
    d = cbind(x[,c("type","date")],ID=s[1],Easting=s[2],Northing=s[3],x[,3:ncol(x)]) 
    return(d) 
}) 
    ## Step 5- writre the data back in the directory 
     for(i in 1:n)  
     write.csv(file = paste("file", i, ".csv", sep = ""), mylist[i], row.names = F) 

私はステップ4で間違っていることを示唆してください。

多くのおかげで、
アヤン

私のサンプルデータ：

> dput (mylist) 
list(structure(list(type = c("wd", "we", "we", "wd", "wd", "wd", 
"wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", "we", 
"wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", "wd", "wd", 
"wd", "we"), date = structure(c(1L, 11L, 18L, 9L, 26L, 30L, 22L, 
5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 10L, 16L, 7L, 24L, 28L, 
20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 4L, 13L), .Label = c("Fri 1 Jan", 
"Fri 15 Jan", "Fri 22 Jan", "Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", 
"Mon 18 Jan", "Mon 25 Jan", "Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", 
"Sat 23 Jan", "Sat 30 Jan", "Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", 
"Sun 24 Jan", "Sun 3 Jan", "Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", 
"Thu 7 Jan", "Tue 12 Jan", "Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", 
"Wed 13 Jan", "Wed 20 Jan", "Wed 27 Jan", "Wed 6 Jan"), class = "factor"), 
    v1 = c(322L, 89L, 242L, NA, 136L, 113L, 70L, 134L, 232L, 
    NA, 127L, 124L, 120L, 162L, 179L, 374L, 477L, NA, 147L, 136L, 
    152L, 196L, 384L, 491L, 136L, NA, 143L, 172L, 226L, 509L), 
    v2 = c(409L, 71L, 206L, NA, 104L, 57L, NA, 98L, 201L, NA, 
    74L, 94L, 69L, 98L, 117L, 277L, 445L, NA, 131L, 90L, 83L, 
    NA, 329L, 473L, 73L, NA, 104L, 113L, 136L, 427L), v3 = c(367L, 
    54L, 211L, NA, 107L, 69L, 51L, 63L, 157L, NA, 56L, 115L, 
    96L, 100L, 118L, 250L, 388L, NA, 124L, 85L, 96L, 118L, 313L, 
    431L, 79L, NA, 93L, 135L, 134L, 290L), v4 = c(343L, 60L, 
    183L, NA, 110L, 53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 
    68L, 99L, 199L, 333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 
    43L, NA, 72L, 96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 
    74L, 58L, 48L, 59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 
    134L, NA, 74L, 82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 
    67L, 186L), v6 = c(140L, 41L, 57L, NA, 104L, 92L, 89L, 94L, 
    68L, NA, 116L, 131L, NA, 110L, 125L, 89L, 89L, NA, 113L, 
    124L, 115L, 116L, 95L, 77L, 126L, NA, 110L, 122L, 119L, 122L 
    ), v7 = c(90L, 104L, 82L, NA, 368L, 258L, NA, 289L, 117L, 
    NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, NA, 397L, 426L, 
    418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 428L, 128L)), .Names = c("type", 
"date", "v1", "v2", "v3", "v4", "v5", "v6", "v7"), row.names = c(NA, 
-30L), class = "data.frame"), structure(list(type = c("wd", "we", 
"we", "wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", "wd", 
"wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", "we", 
"wd", "wd", "wd", "wd", "wd", "we"), date = structure(c(1L, 11L, 
18L, 9L, 26L, 30L, 22L, 5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 
10L, 16L, 7L, 24L, 28L, 20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 
4L, 13L), .Label = c("Fri 1 Jan", "Fri 15 Jan", "Fri 22 Jan", 
"Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", "Mon 18 Jan", "Mon 25 Jan", 
"Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", "Sat 23 Jan", "Sat 30 Jan", 
"Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", "Sun 24 Jan", "Sun 3 Jan", 
"Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", "Thu 7 Jan", "Tue 12 Jan", 
"Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", "Wed 13 Jan", "Wed 20 Jan", 
"Wed 27 Jan", "Wed 6 Jan"), class = "factor"), v1 = c(322L, 89L, 
242L, NA, 136L, 113L, 70L, 134L, 232L, NA, 127L, 124L, 120L, 
162L, 179L, 374L, 477L, NA, 147L, 136L, 152L, 196L, 384L, 491L, 
136L, NA, 143L, 172L, 226L, 509L), v2 = c(409L, 71L, 206L, NA, 
104L, 57L, NA, 98L, 201L, NA, 74L, 94L, 69L, 98L, 117L, 277L, 
445L, NA, 131L, 90L, 83L, NA, 329L, 473L, 73L, NA, 104L, 113L, 
136L, 427L), v3 = c(367L, 54L, 211L, NA, 107L, 69L, 51L, 63L, 
157L, NA, 56L, 115L, 96L, 100L, 118L, 250L, 388L, NA, 124L, 85L, 
96L, 118L, 313L, 431L, 79L, NA, 93L, 135L, 134L, 290L), v4 = c(343L, 
60L, 183L, NA, 110L, 53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 
68L, 99L, 199L, 333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 43L, 
NA, 72L, 96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 74L, 58L, 
48L, 59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 134L, NA, 74L, 
82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 67L, 186L), v6 = c(140L, 
41L, 57L, NA, 104L, 92L, 89L, 94L, 68L, NA, 116L, 131L, NA, 110L, 
125L, 89L, 89L, NA, 113L, 124L, 115L, 116L, 95L, 77L, 126L, NA, 
110L, 122L, 119L, 122L), v7 = c(90L, 104L, 82L, NA, 368L, 258L, 
NA, 289L, 117L, NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, 
NA, 397L, 426L, 418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 
428L, 128L)), .Names = c("type", "date", "v1", "v2", "v3", "v4", 
"v5", "v6", "v7"), row.names = c(NA, -30L), class = "data.frame"), 
    structure(list(type = c("wd", "we", "we", "wd", "wd", "wd", 
    "wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", 
    "we", "wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", 
    "wd", "wd", "wd", "we"), date = structure(c(1L, 11L, 18L, 
    9L, 26L, 30L, 22L, 5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 10L, 
    16L, 7L, 24L, 28L, 20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 
    4L, 13L), .Label = c("Fri 1 Jan", "Fri 15 Jan", "Fri 22 Jan", 
    "Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", "Mon 18 Jan", "Mon 25 Jan", 
    "Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", "Sat 23 Jan", "Sat 30 Jan", 
    "Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", "Sun 24 Jan", "Sun 3 Jan", 
    "Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", "Thu 7 Jan", "Tue 12 Jan", 
    "Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", "Wed 13 Jan", "Wed 20 Jan", 
    "Wed 27 Jan", "Wed 6 Jan"), class = "factor"), v1 = c(322L, 
    89L, 242L, NA, 136L, 113L, 70L, 134L, 232L, NA, 127L, 124L, 
    120L, 162L, 179L, 374L, 477L, NA, 147L, 136L, 152L, 196L, 
    384L, 491L, 136L, NA, 143L, 172L, 226L, 509L), v2 = c(409L, 
    71L, 206L, NA, 104L, 57L, NA, 98L, 201L, NA, 74L, 94L, 69L, 
    98L, 117L, 277L, 445L, NA, 131L, 90L, 83L, NA, 329L, 473L, 
    73L, NA, 104L, 113L, 136L, 427L), v3 = c(367L, 54L, 211L, 
    NA, 107L, 69L, 51L, 63L, 157L, NA, 56L, 115L, 96L, 100L, 
    118L, 250L, 388L, NA, 124L, 85L, 96L, 118L, 313L, 431L, 79L, 
    NA, 93L, 135L, 134L, 290L), v4 = c(343L, 60L, 183L, NA, 110L, 
    53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 68L, 99L, 199L, 
    333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 43L, NA, 72L, 
    96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 74L, 58L, 48L, 
    59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 134L, NA, 74L, 
    82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 67L, 186L), 
     v6 = c(140L, 41L, 57L, NA, 104L, 92L, 89L, 94L, 68L, 
     NA, 116L, 131L, NA, 110L, 125L, 89L, 89L, NA, 113L, 124L, 
     115L, 116L, 95L, 77L, 126L, NA, 110L, 122L, 119L, 122L 
     ), v7 = c(90L, 104L, 82L, NA, 368L, 258L, NA, 289L, 117L, 
     NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, NA, 397L, 
     426L, 418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 428L, 
     128L)), .Names = c("type", "date", "v1", "v2", "v3", 
    "v4", "v5", "v6", "v7"), row.names = c(NA, -30L), class = "data.frame")) 

Answer 1

問題は、あなたがlapplyコールに存在しませんiによってインデックスあなたのファイル名にしてみてくださいということです。 mycsv私ができることなく、

が

lapply(1:length(mylist), function(i) { 
    mylist.i <- mylist[[i]] 
    s = strsplit(mycsv[i], "_" , fixed = TRUE)[[1]] 
    d = cbind(mylist.i[, c("type", "date")], ID = s[1], Easting = s[2], Northing = s[3], mylist.i[, 3:ncol(mylist.i)]) 
    return(d) 
}) 

ことに注意してください：あなたはmylistとmycsvのための共通の指標を必要として、あなたは、その後のような何かをしようとここにlapplyを呼び出すことを主張したい場合

は、あなたが単純なループを使用したりできこれをテストせず、あなたのコードの他の部分をチェックしようとしませんでした。