row names of 'rowsum()'

'rowsum()' seems to add row names to the resulting matrix, corresponding to
the respective 'group' values.  This is very handy, but it is not
documented.  Should the documentation mention it so it could be relied upon
as part of API?

Cheers,
Ott

Ott Toomet

Visiting Researcher
School of Information
Mary Gates Hall, Suite 310
University of Washington
Seattle, WA 98195

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