[R] Does a data frame have indexes for columns?

[Santosh Srinivas]

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,
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> 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!
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> xiagao1982
> 2011-05-19
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