[R] Group by in R

Nick Angelou nikolay12 at yahoo.com
Mon Apr 13 12:33:56 CEST 2009


Hi,

I have the following table data:

f1, f2, f3, f4.

I want to compute the counts of unique combinations of f1-f4. In SQL I would
just write:

SELECT COUNT(*) FROM <table> GROUP BY f1, f2, ..,f4.

How to do this in R?

Thanks,

Nick
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