If语句具有多个范围(R) [英] If statements with multiple ranges (R)

问题描述

有人知道是否可能使用基数R的"ifelse"基团.一次声明多个范围条件?使用dplyr会更容易吗?

Does anyone know if its possible to use the base R "ifelse" statement for multiple range conditions at once? Is this easier with dplyr?

 If df$var1 < 5 and df$var2 < 5 , then df$var3 = "a" 

If df$var1 > 5 and df$var1<10 AND df$var2>5 and df$var2<10, then df$var3 = "b"

 If df$var1 >10 and df$var2 >10, then df$var3 = "c" 

是否可以将所有这些组合成一个ifelse语句?

Can all this be combined into a single ifelse statement?

谢谢

推荐答案

您可以使用 case_when :

library(dplyr)
df %>%
  mutate(var3 = case_when(var1 < 5 & var2 < 5 ~ 'a', 
                          var1 > 5 & var1 < 10 & var2 > 5 & var2 < 10 ~ 'b', 
                          var1 >10 & var2 >10 ~ 'c'))

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