[R] Indexes on dataframe columns?

Ranjan Bagchi ranjan.bagchi at frotz.com
Thu Oct 25 15:27:51 CEST 2007

Hi --

I'm working with some data frames with fairly high nrows (call it 8 
columns, by 20,000 rows).  Are there any indexes on these columns?

When I do a df[df$foo == 42,] [which I think is idiomatic], am I doing a linear 
search or something better?  If the column contents is ordered, I'd like 
to at least be doing a naive binary search.



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