[R] go back a block of code in history

[Peng Yu]

Suppose I run the following code in the R session. At the last prompt
'>', I want to retrieve the second command (staring with 'y'). But I
have to type up arrow many times, which is very inconvenient. I'm
wondering if there is a way to configure R to skip block of code in
the history?

> x=list(a=c(1,2),b=c(3,4,5))
> y=list(a=c(1,2),b=c(3,4,5))
> lapply(seq(along=x)
+     ,function(i){
+       cbind(
+           x[[i]]
+           ,y[[i]]
+           )
+     }
+     )
[[1]]
     [,1] [,2]
[1,]    1    1
[2,]    2    2

[[2]]
     [,1] [,2]
[1,]    3    3
[2,]    4    4
[3,]    5    5

>