[R] Problem with zoo::window()

[Gabor Grothendieck]

On Tue, Sep 27, 2011 at 5:23 AM, Agustin Lobo
<Agustin.Lobo at ictja.csic.es> wrote:
> I have the following time series:
>
>> class(CCasadesz2)
> [1] "zoo"
>> setmanes <- cut(time(CCasadesz2),breaks="weeks")
>> CCasadeswz <- aggregate(CCasadesz2,sum,by=setmanes)

cut produces a "factor", not a "Date". The by= argument in
aggregate.zoo should not be a factor but rather should define the new
index. If you want the new index to be a "Date" class then by= should
define a "Date" vector.  See ?aggregate.zoo .

Try:

setmanes <- as.Date(format(setmanes))

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