[R] Different way of aggregating

[skan]

Hi


Usually "aggregate" is used to calculate things such as the sum of all data
on the first day, the sum next day, and so on.
But how can I calculate the mean of the first hour of all days, the mean of
the second hour of all days, and so on.  ???

That's 
Most examples:
today at 1am + today at 2am + today at 3am +....                    -> sum
today
tomorrow at 1am + tomorrow at 2am + tomorrow at 3am +....     -> sum
tomorrow
..................
aggregate(data, as.Date,sum)


But what I need is:
data today at 1 + data tomorrow at 1 + data in two days at 1 + .....    -> 
sum at 1am
data today at 2 + data tomorrow at 2 + data in two days at 2 + .....    -> 
sum at 2am
data today at 3 + data tomorrow at 3 + data in two days at 3 + .....    -> 
sum at 3am
.............

How can I do it??

cheers
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