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heiner
2002 Feb 07
4
Grouping and Computing
...ese
sums should be kept in form of another vector.
My two questions are then
- Which object type (matrix, dataframe, list) lends itself to such a
problem?
- Do I have to create different objects for the groups, or can I compute the
vector of sums directly? And how?
Thanks in advance
Alexander Hener
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