Dear Manli,

Try this:

table1[table1$treatment=="low" & table1$size=="large",]

HTH,

Jorge


On Tue, Jun 3, 2008 at 11:19 PM, Manli Yan <manliyanrhelp@gmail.com> wrote:

>   a table with three varialbe:treatment
> (low,high),size(large,small),response y
>  I want all response y with treatment=low and size=large,
>  I try to write as :
> treatment<-c("low","low","high","high")
> size<-c("small","large","small","large")
> y<-c(1,2,4,5)
> table1<-data.frame(treatment,size,y)
> x=table1$y(treatment=="low"& size=="large")
>
> this does not work out~
>
> thank you for the help~
>
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