[R] aggregating daily values

[antonio rodriguez]

Achim Zeileis escribió:
> On Tue, 26 Jun 2007, antonio rodriguez wrote:
>
>   
>> Hi,
>>
>> I swear I have read almost all the posted messages about this issue, but
>> it's evident I couldn't find an answer (surely esay) to my problem. What
>> I want is the following:
>>
>> Make  8 days aggregates from a daily series like this (dput output):
>>     
>
> I'm not sure which days you want to aggregate exactly. If you want to
> replace the observations from 1985-01-02 until 1985-01-09 by a single
> observation, maybe you want something like
>   new.time <- as.Date(8 * floor(as.numeric(time(z))/8) + 7)
>   z2 <- aggregate(z, new.time, mean)
> which gives averages for 8 days (anchored on the last day of the 8-day
> period).
>
> Does this what you're looking for? Look at the "zoo" vignettes for more
> information/examples.
> Z
>
>
>
>   
It's a very good solution. And... if I want that the anchor is placed in 
the middle of the 8 days period?

Thanks,

Antonio

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