[R] grouping data together

[jim holtman]

If your grouping is a list, then you can use 'sapply'; e.g.,

sapply(yourRanking, function(x) sum(x$rank))  # or whatever you want the sum of.

On Sun, Nov 9, 2008 at 4:00 PM, Swanton0822 <iverson0822 at hotmail.com> wrote:
>
> Hi,
> i have group all the data, but now if i would want to sum all the rank in
> each group, how can i do it?
> ie. i want to sum the rank in every group, not total. so there will be a sum
> of rank for month Jan,Feb,.....Dec, therefore there will be total of 12
> vaule of ranking sum.
> many thanks,
> --
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?