[R] how to create data.frames from vectors with duplicates

peter dalgaard pdalgd at gmail.com
Thu Sep 8 13:09:12 CEST 2011

On Sep 8, 2011, at 03:18 , zhenjiang xu wrote:

> Thanks for all your replies. I am using rowsum() and it looks efficient. I
> hope I could do some benchmark sometime in near future and let people know.
> Or is there any benchmark result available?

I'm a bit surprised that no-one thought of xtabs(x ~ y)

It won't win the speed competition, though.

Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

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