分裂矢量

Question

我有一个由"Y"和"N"组成的向量x.

> x
 [1] Y N N N N N N N N N N Y N N N N

我想把它拆分成

> x1
 [1] Y N N N N N N N N N N 

和

> x2
 [1] Y N N N N 

这些向量总是以"Y"开头,并在下一个"Y"之前接收所有"N".关于如何做到这一点的建议？

Answer 1

您可以使用单行的组合cumsum和split来执行此操作:

x <- c("Y","N","N","N","N","N","N","N","N","N","N","Y","N","N","N","N")
v <- split(x,paste("x",cumsum(x=="Y"),sep=""))