在 dataframe 列中显示唯一字符

Question

我有一个唯一的 object 名称的数据框。 我需要创建列中使用的所有唯一字符的列表。 有没有办法显示列中使用的所有唯一字符的列表？

示例数据：

Performance PM
Truck Tips - B - 2001
ASE Parts Specialist (P1)

Output：

a
b
c
d
-
(
1
2

Answer 1

data <- "Example data:
Performance PM
Truck Tips - B - 2001
ASE Parts Specialist (P1)"


sort(unique(strsplit(data,"")[[1]]))

 [1] "-"  " "  "\n" "("  ")"  ":"  "0"  "1"  "2"  "a"  "A"  "B"  "c"  "d"  "e"  "E"  "f"  "i"  "k"  "l"  "m"  "M"  "n"  "o"  "p"  "P" 
[27] "r"  "s"  "S"  "t"  "T"  "u"  "x"