You are telling it to merge by ID only. But it sounds like you would like
it to merge by both ID and age.
merge(Elder, Younger, all=TRUE)
Jean
On Thu, Jan 16, 2014 at 6:25 AM, kingsly <ecoking...@yahoo.co.in> wrote:
> Dear R community
>
> I have a two data set called "Elder" and "Younger".
> This is my code for simple merge.
>
> Elder <- data.frame(
> ID=c("ID1","ID2","ID3"),
> age=c(38,35,31))
> Younger <- data.frame(
> ID=c("ID4","ID5","ID3"),
> age=c(29,21,31))
>
> mer <- merge(Elder,Younger,by="ID", all=T)
>
> Output I am expecting:
>
> ID age
> ID1 38
> ID2 35
> ID3 31
> ID4 29
> ID5 21
>
> It looks very simple. But I need help.
> When I run the code it gives me age.x and age.y.
> thank you
>
>
>
>
> --
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>
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