我在遇到以下问题时遇到了很多麻烦,似乎无法通过广泛的搜索找到答案.如果我有以下内容:
> fac1 <- factor(c("a", "b", "c"))
> fac2 <- factor(c("d", "e", "f"))
> fac3 <- interaction(fac1,fac2)
> fac3
[1] a.d b.e c.f
Levels: a.d b.d c.d a.e b.e c.e a.f b.f c.f
我可以运行什么功能来拆分fac3,以便获得投入交互的原始因素的级别？以便:
> myFun(fac3, 1)
[1] "a" "b" "c" "a" "b" "c" "a" "b" "c"
> myFun(fac3, 2)
[2] "d" "d" "d" "e" "e" "e" "f" "f" "f"
谢谢.