r - 在R中的数据帧的列中查找每个字符串的长度

Question

我想计算 name 的每个字符串的字符数柱子。我的数据框 sample如下图所示:

date        name           expenditure      type
23MAR2013   KOSH ENTRP     4000             COMPANY
23MAR2013   JOHN DOE       800              INDIVIDUAL
24MAR2013   S KHAN         300              INDIVIDUAL
24MAR2013   JASINT PVT LTD 8000             COMPANY
25MAR2013   KOSH ENTRPRISE 2000             COMPANY
25MAR2013   JOHN S DOE     220              INDIVIDUAL
25MAR2013   S KHAN         300              INDIVIDUAL
26MAR2013   S KHAN         300              INDIVIDUAL

为什么会这样 nchar给我一个随机数列表？ str_length()也是如此来自 stringr包裹

Length <- aggregate(nchar(sample$name), by=list(sample$name), FUN=nchar)

输出

         Group.1       x
1 JASINT PVT LTD       2
2       JOHN DOE       1
3     JOHN S DOE       2
4     KOSH ENTRP       2
5 KOSH ENTRPRISE       2
6         S KHAN 1, 1, 1

期望输出:

     Group.1       x
1 JASINT PVT LTD       14
2       JOHN DOE       8
3     JOHN S DOE       10
4     KOSH ENTRP       10
5 KOSH ENTRPRISE       14
6         S KHAN       6

上表的csv:

"Date","name","expenditure","type"
"23MAR2013","KOSH ENTRP",4000,"COMPANY"
"23MAR2013 ","JOHN DOE",800,"INDIVIDUAL"
"24MAR2013","S KHAN",300,"INDIVIDUAL"
"24MAR2013","JASINT PVT LTD",8000,"COMPANY"
"25MAR2013","KOSH ENTRPRISE",2000,"COMPANY"
"25MAR2013","JOHN S DOE",220,"INDIVIDUAL"
"25MAR2013","S KHAN",300,"INDIVIDUAL"
"26MAR2013","S KHAN",300,"INDIVIDUAL"

Answer 1

您也可以 apply nchar到您的数据框并从相应的列中获取结果:

data.frame(names=temp$name,chr=apply(temp,2,nchar)[,2])
      names chr
1     KOSH ENTRP  10
2       JOHN DOE   8
3         S KHAN   6
4 JASINT PVT LTD  14
5 KOSH ENTRPRISE  14
6     JOHN S DOE  10
7         S KHAN   6
8         S KHAN   6