[R] How to sum and group data by DATE in data frame

[Cren]

Hello, 

I have a time series with intraday datas, sampled every 30'; I would need to
aggregate them in this way: summing up all datas within a day.

I tried to use *aggregate(...)* function to get my goal, but it aggregates
in wrong way (I did not understand how so far); what I need is like
*sum(...)* function applied to datas within the same day.

Thank you :)

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