[R] sum in vector

km srikrishnamohan at gmail.com
Sun Nov 14 20:21:32 CET 2010

 Hi all,
>> On Sun, Nov 14, 2010 at 10:06 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
>>> Try this:
>>>  rowsum(price, market)
  does it work  with multiple factors/groups ?
  using multiple factors such as c(factor1,factor2,factor3,...) as
second arg with  rowsum() doesnt seem to work!
  am i missing something ?

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