[R] cumsum function with data frame

From: <n.vialma_at_libero.it>
Date: Thu, 03 Jun 2010 17:58:37 +0200 (CEST)

Dear list,
I have a problem with the cumsum function. I have a data frame like the following one

variable        Year       value
EC01             2005         5

EC01             2006         10

AAO1            2005          2 

AAO1           2006          4
what I would like to obtain is
variable        Year       value   cumsum

EC01             2005         5           5

EC01             2006         10         15

AAO1            2005          2            2

AAO1           2006          4            6

if I use the by function or the aggregate function the result is a list or something else, what I want is a data frame as I showed above... anyone knows how to get it???
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