[R] Efficient ways of merging data frames

[jim holtman]

Have you tried 'pasting' the values together and then using this as
the key for the join?

On Sun, Sep 12, 2010 at 2:39 PM, Anyi Zhu <anyi.zhu at gmail.com> wrote:
> Hi all,
>
> I am just wondering if there is a more efficient way of merging two large
> datasets based on the values of multiple columns, some of which are not
> numerical.
>
> The default merge function in dataframe is very inefficient and the merge
> function in data.table seems to be faster, but it does not seem to allow
> keys that are not numerical in nature.
>
> Any other suggestion?
>
> Thanks a lot!
>
>        [[alternative HTML version deleted]]
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?