Not quite:
> rbind(Elder, Younger)
ID age
1 ID1 38
2 ID2 35
3 ID3 31
4 ID4 29
5 ID5 21
6 ID3 31
Note that ID3 is duplicated.
Should be:
> merge(Elder, Younger, by = c("ID", "age"), all = TRUE)
ID age
1 ID1 38
2 ID2 35
3 ID3 31
4 ID4 29
5 ID5 21
He wants to do a join on both "ID" and "age" to avoid duplications of rows when
the same ID and age occur in both data frames. If the same column names (eg
"Var") appears in both data frames and are not part of the 'by' argument, you
end up with Var.x and Var.y in the result.
In the case of two occurrences of the same ID but two different ages, if that
is possible, both rows would be added to the result using the above code.
Regards,
Marc Schwartz
On Jan 16, 2014, at 9:04 AM, Frede Aakmann Tøgersen <fr...@vestas.com> wrote:
> Ups, sorry that should have been
>
> mer <- rbind(Elder, Younger)
>
> /frede
>
>
> -------- Oprindelig meddelelse --------
> Fra: Frede Aakmann Tøgersen
> Dato:16/01/2014 15.54 (GMT+01:00)
> Til: "Adams, Jean" ,kingsly
> Cc: R help
> Emne: Re: [R] Doubt in simple merge
>
> No I think the OP wants
>
> mer <- merge(Elder, Younger)
>
> Br. Frede
>
>
> -------- Oprindelig meddelelse --------
> Fra: "Adams, Jean"
> Dato:16/01/2014 15.45 (GMT+01:00)
> Til: kingsly
> Cc: R help
> Emne: Re: [R] Doubt in simple merge
>
> 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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