R help - May 2011 - Does a data frame have indexes for columns?

Hi all,

I wonder if I can create indexes for columns in a data frame to speed up data
selection by matching column values, just like indexes for large tables in a
relational database? Thank you!




xiagao1982
2011-05-19

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Check data.table ... It benefits a lot from indexing data in data frames

On Thu, May 19, 2011 at 7:41 PM, xiagao1982 <xiagao1982 at gmail.com>
wrote:
> Hi all,
>
> I wonder if I can create indexes for columns in a data frame to speed up
data selection by matching column values, just like indexes for large tables in
a relational database? Thank you!
>
>
>
>
> xiagao1982
> 2011-05-19
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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