Use aggregate() for aggregation and use indexing or subset() for selection.
Alternately try the sqldf package: http://sqldf.googlecode.com
which allows one to perform SQL operations on data frames.
On Fri, Jun 6, 2008 at 6:12 AM, <[EMAIL PROTECTED]> wrote:
> Dear R experts,
>
> I am currently fac
Dear R experts,
I am currently facing a tricky problem which I have read a lot about in
the various R mailing lists without finding exactly what I need.
I have a big data frame DF (about 2,000,000 rows) with 7 columns being
variables and 1 being a measure (using reshape package nomeclature).
There
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