如果您这样做，它将按预期工作:

It works as intended if you do:

mutate(V, V4 = case_when(
  V1 == 2 | V2 == 2 | V3 == 2 ~ 2,
  V1 == 1 | V2 == 1 | V3 == 1 ~ 1,
  V1 == 0 | V2 == 0 | V3 == 0 ~ 0
))

此外，您应该使用data.frame()，data_frame()或tibble()之一而不是cbind()，以使V对象更符合dplyr函数，后者期望使用数据帧而不是矩阵(即由cbind()产生.

Also, you should use one of data.frame(), data_frame() or tibble() instead of cbind() to make the V object more compliant to dplyr functions, which expect a data frame instead of a matrix (which is what gets produced by cbind().