我正在尝试做某事,但不记得/找到答案。我有一份来自人口普查局的城市名称列表,他们把城市的类型放在最后,这弄乱了我的match()
.
我想做这个:
Middletown Township
Sunny Valley Borough
Hillside Village
进入这个:
Middletown
Sunny Valley
Hillside
有什么建议么?理想情况下,我还想知道lastIndexOf()
R 中是否有函数。
这是输出:
> dput(df1)
structure(list(id = c(1, 2, 3), city = structure(c(2L, 3L, 1L
), .Label = c("Hillside Village", "Middletown Township", "Sunny Valley Borough"
), class = "factor")), .Names = c("id", "city"), row.names = c(NA,
-3L), class = "data.frame")