Question

因为我不知道如何以正确的方式在文本中描述我的问题，我给你举了一个例子。我＆＃39;以下数据框：

my.data = data.frame("names" = c("Michael","Thomas","Daniel","Peter","Michael","Thomas","Ruben","Thomas"))

给出：

    names
1 Michael
2  Thomas
3  Daniel
4   Peter
5 Michael
6  Thomas
7   Ruben
8  Thomas

我想要的输出是：

      names
1   Michael
2    Thomas
3    Daniel
4     Peter
5 Michael.2
6  Thomas.2
7     Ruben
8  Thomas.3

是否有人建议如何以更自动的方式实现更大的数据框架？

提前致谢。

Answer 1

我们有一些选择

my.data$names <- with(my.data, sub("\\.1$", "", paste(names, ave(seq_along(names),
        names, FUN=seq_along), sep=".")))
my.data$names
#[1] "Michael"   "Thomas"    "Daniel"    "Peter"     "Michael.2" "Thomas.2"  "Ruben"     "Thomas.3"

或make.unique

make.unique(as.character(my.data$names))
#[1] "Michael"   "Thomas"    "Daniel"    "Peter"     "Michael.1" "Thomas.1"  "Ruben"     "Thomas.2"

添加数据框中字符串的出现次数

1 个答案: