R help - May 2013 - same key row merge in dataframe

HI,
Try this:
dat1<- read.table(text="
V1??? V2
A????? 1
B????? 2
A???? 1
B????? 3 
",sep="",header=TRUE,stringsAsFactors=FALSE)
library(plyr)
ddply(dat1,.(V1),summarize, V2=list(V2))
#? V1?? V2
#1? A 1, 1
#2? B 2, 3

#or
aggregate(V2~V1,data=dat1,FUN= function(x) x,simplify=FALSE)
#? V1?? V2
#1? A 1, 1
#2? B 2, 3



A.K.

>Dear R-users, 
>
>I have dataframe 
>V1 ? ?V2 
>A ? ? ?1 
>B ? ? ?2 
>A ? ? 1 
>B ? ? ?3 
>
>I want to get this output 
>
>V1 ? ? ? ? V2 
>A ? ? ? 1,1 
>B ? ? ? 2 ,3 
>
>
>How to.... ?? 
>
>Please