参考：case_when: A general vectorised if
Others 用 TRUE 表示，举例如下：
x <- 1:50
case_when(
x %% 35 == 0 ~ "fizz buzz",
x %% 5 == 0 ~ "fizz",
x %% 7 == 0 ~ "buzz",
TRUE ~ as.character(x)
)标签：case,845,函数,when,vectorised,语言 From： https://www.cnblogs.com/alex-bn-lee/p/17514201.html