我有一个 data.frame ，其中有一个字符串列“city”，它由用 分隔的连接字母组成;
dt = data.frame(id = letters[1:6],
city = c("A;B","B;D","A;D;G","A;C","F;G","C;D"))
dt
# id city
# 1 a A;B
# 2 b B;D
# 3 c A;D;G
# 4 d A;C
# 5 e F;G
# 6 f C;D`
我希望能从“城市”一栏得到独特的个体字母：
city = c("A","B","C","D","F","G")`
这个怎么做？
更清洁的解决方案是：
dt= data.frame(id=letters[1:6],city = c("A;B","B;D","A;D;G","A;C","F;G","C;D"))
city=strsplit(as.character(dt$city), ";")
city=sort(unique(unlist(city)))
[1] "A" "B" "C" "D" "F" "G"
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