[R] merge 2 data.frames in dependence of 2 values

[Michael Dewey]

On 13/11/2014 14:02, Matthias Weber wrote:
> Hello togehter,
>
> i have a little problem. Maybe anyone can help me.

I think you might find
?merge
enlightening

Indeed given that the word merge occurs in your subject line and your 
text it is surprising you have not already found it.

>
> I have 2 data.frames, which look like as follows:
> First:
>
>          NAME    MONTH     BONUS
> 1      Andy     2014-10       100
> 2      Pete     2014-10        200
> 3      Marc    2014-10        300
> 4      Andy    2014-11        400
>
> Second:
>
>        NAME  MONTH    BONUS_2
> 1    Andy    2014-10       150
> 2    Pete     2014-11       180
> 3    Jason   2014-10       190
> 4    Paul     2014-10       210
> 5    Andy    2014-11       30
>
> How can I merge this 2 data.frames, if I want the following result:
>
>          NAME    MONTH     BONUS    BONUS_2
> 1     Andy     2014-10       100            150
> 2     Pete     2014-11                         180
> 3     Marc    2014-10        300
> 4     Andy    2014-11       400             30
> 5     Pete     2014-10       200
> 6     Jason  2014-10                         190
> 7     Paul     2014-10                         210
>
> The important thing is, that for every accordance in the Columns "NAME" and "MONTH" I get a new line.
>
> Thanks for your help.
>
> Best regards.
>
> Mat
>
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-- 
Michael
http://www.dewey.myzen.co.uk