> x<-factor(c(2,4),labels=c("A","B"))
<br>
> y<-c(0,7,0,7)<br>
> L1<-list(x,y);L2<-list(C1=x,C2=y)
<br>
> L1
<br>
[[1]]
<br>
[1] A B
<br>
Levels: A B
<br>
<br>
[[2]]
<br>
[1] 0 7 0 7
<br>
<br>
> L2
<br>
$`C1`
<br>
[1] A B
<br>
Levels: A B
<br>
<br>
$C2
<br>
[1] 0 7 0 7
为什么列表L2的对象x的名字C1加了引号' '