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

From: xiagao1982 <xiagao1982_at_gmail.com>
Date: Thu, 19 May 2011 22:11:59 +0800

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!


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