基于多个条件添加新列

Question

我有一个data，看起来像这样：

< Id <- c(A,B,C,D,E)
< Father <- c(2,1,5,4,2)
< Mother <- c(1,3,3,5,1)

我要基于父亲或母亲的较高价值添加一个新列parent。基本上：

< Id <- c(A,B,C,D,E)
< Father <- c(2,1,5,4,2)
< Mother <- c(1,3,3,5,1)
< Parent <- c(2,3,5,5,2)

Answer 1

我们可以使用pmax来获取多列的元素max

library(dplyr)
df1 %>%
    mutate(Parent = pmax(Father, Mother))

---

或者在base R

中

df1$Parent <- with(df1, pmax(Father, Mother))

或带有ifelse

的另一个选项

df1$Parent <- with(df1, ifelse(Father > Mother, Father, Mother))

数据

df1 <- data.frame(Id, Father, Mother)