更改R

Question

如果我有以下向量：

x<-c("blue","green","green","blue","blue")

转换为因子时，我发现以下内容：

Factor w/ 2 levels "blue","green": 1 2 2 1 1

我想将数字1 and 2更改为0 and 1。

可以做到吗？

非常感谢