根据变量的第n个外观创建一个列表。谢谢

Question

我希望能够看到一个值已经在数据集中列出了多少次。谢谢！！

test = c("a", "a", "b", "b", "a", "c") 我希望能够根据上述信息返回new_variable = c(1, 2, 1, 2, 3, 1)

Answer 1

使用tidyverse

library(tidyverse)


test = c("a", "a", "b", "b", "a", "c")

resulting_vector <- test %>% as_tibble() %>%
    group_by(value) %>%
    mutate(total = row_number()) %>%
    pull(total)

resulting_vector