[R] Unique?

[Robert Citek]

On May 10, 2006, at 4:02 PM, Guenther, Cameron wrote:
> How can I use unique to extract the rows that have repeated tripid's
> only, not a unique value for each variable but only for TRIPID.  I  
> then
> want to condense the unique values by summing the CONVUNIT for each
> unique value of TRIPID.

Thanks, Cameron, for this question.  This type of manipulation would  
be relatively simple to do in a RDBMS (e.g. MySQL, PostgreSQL,  
Oracle, etc.)  But I'm curious to see how one would do the same in  
R.  So, if folks send you solutions off-list, please do post them  
back to the list.

Regards,
- Robert
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