[R] Group by
xmoon2000 at googlemail.com
Thu Mar 11 10:48:41 CET 2010
I have a matrix with a POSIXct as a numeric in the first column.
I would like to create a new matrix that is "grouped by" my chosed time
i.e. So I would like to group by hour or day or 5 days, and have all my
columns be summed or averaged or counted..
I want to convert this into say 5 minutes "bars" and sum columns
How can I do this?
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