[R] rollapply() opertation on time series

[rcoder]

Hi Gabor,

Thanks for your reply. Assuming I have a time series that is ready made
(i.e. not constructed it using a zoo function) will the procedure below
still retain the dates in the matrix?

Thanks,

rcoder

quote author="Gabor Grothendieck">
rollapply along an index:

library(zoo)
z <- zoo(matrix(101:110, 5), 201:205)
tt <- time(z)
zz <- zoo(seq_along(tt), tt)
out <- rollapply(zz, 3, function(ix) list(z[ix,]))
str(out) # list of zoo objects


On Mon, Jul 28, 2008 at 5:03 PM, rcoder <mpdotbook at gmail.com> wrote:
>
>
> rcoder wrote:
>>
>> Hi everyone,
>>
>> Is there a way to perform a rollapply operation on a time series data
>> matrix and preserve the time frame? Currently, when I apply rollapply in
>> its standart form, the date column is no longer present in the o/p
>> matrix.
>>
>> Thanks,
>>
>> rcoder
>>
>
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