[R] sum specific rows in a data frame

hadley wickham h.wickham at gmail.com
Thu Apr 15 16:42:50 CEST 2010

The problem is that the new version of plyr is incompatible with
ggplot2, so I need to make some changes there before I can release it.
 Hopefully this summer.


On Thu, Apr 15, 2010 at 1:33 PM, Vijay Nori <vijay.nori at gmail.com> wrote:
> This is very cool...thanks Hadley. When are you planning to release that
> version?
> On Thu, Apr 15, 2010 at 9:09 AM, hadley wickham <h.wickham at gmail.com> wrote:
>> On Thu, Apr 15, 2010 at 1:16 AM, Chuck <vijay.nori at gmail.com> wrote:
>> > Depending on the size of the dataframe and the operations you are
>> > trying to perform, aggregate or ddply may be better.  In the function
>> > below, df has the same structure as your dataframe.
>> So there are some big speed improvements in the works.
>> Hadley

Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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