[R] problems with merge() - the output has many repeated lines

[Hadley Wickham]

You may find a close reading of ?merge helpful, particularly this
sentence: "If there is more than one match, all possible
matches contribute one row each"  (so check that you don't have
multiple matches).

Hadley

On Sat, Aug 21, 2010 at 10:45 AM, Cecilia Carmo <cecilia.carmo at ua.pt> wrote:
> Hi everyone,
>
> I have been merging many big dataframes (about 80000 rows each) and I never
> had this problem, but now it happened to me and I want to know if someone
> knows what could be happening.
> The final dataframe has many rows, an impossible number! I have done
> edit(dataframe) and I saw that there are many repeated rows (all equal).
>
> Thanks for any help,
>
> Cecília Carmo
> Universidade de Aveiro
> Portugal
>
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-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/