On Nov 2, 2011, at 9:06 AM, Celine wrote:
I have a similar problem
I have a dataframe :
CELLCD AreaProtected
8928 52.39389
8928 41.91511
8929 21.21975
8929 63.65925
8930 26.08547
8930 14.04602
I wouldlike to sum the AreaProtected if it is the same CELLCD in
another
column :
CELLCD AreaProtected SumAreaProtected
8928 52.39389 94.309
8928 41.91511
8929 21.21975 84,879
8929 63.65925
8930 26.08547
8930 14.04602
I am just started with R and I don't know how I can do that.
Do you have any ideas ?
You could get sums within groups using the ave() function. It would
put values on all rows. Was there a reason you only wanted values on
the first? Then if you wanted to make the non-first elements NA that
could also be done.
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