如何基于其他列的总和添加新列

Question

我试图获得所有伤害每行的总数，但下面的代码给了我所有行的总伤害

flights$Total.Injuries =  sum( flights$Total.Fatal.Injuries,
                           flights$Total.Minor.Injuries,
                           flights$Total.Serious.Injuries,na.rm = TRUE )

我在这里做错了什么？

Answer 1

尝试rowSums(flight, na.rm=T)，

或rowSums(cbind(flights$Total.Fatal.Injuries, flights$Total.Minor.Injuries, flights$Total.Serious.Injuries),na.rm=T)

Answer 2

尝试：

flights$Total.Injuries <= rowSums(flights[ , c(x, y, z)], na.rm=TRUE)

，其中     x = Total.Fatal.Injuries的列号，     y = Total.Minor.Injuries的列号， 和     z = Total.Serious.Injuries的列号

Answer 3

或另一个选项Reduce +

flights$Total.Inuries <- Reduce(`+`, flights)