[R] Question on "Zoo" object

[Bogaso]

Thanks Gabor for this reply. Your first reply answers my question, however
end is not. Here you said :

> set.seed(1) 
> daily.dat <- zooreg(rnorm(500), start=as.Date("2000-01-01"), frequency=1) 
> aggregate(daily.dat, as.yearmon, sd) 
 Jan 2000  Feb 2000  Mar 2000  Apr 2000  May 2000  Jun 2000  Jul 2000  Aug
2000 
0.9370553 0.7743405 0.9514569 0.8813805 0.9188229 1.0969453 1.0327717
1.0392682 
 Sep 2000  Oct 2000  Nov 2000  Dec 2000  Jan 2001  Feb 2001  Mar 2001  Apr
2001 
1.0276672 1.0173960 0.8953093 1.0964024 0.9696928 0.9507952 1.1275021
1.1410237 
 May 2001 
1.5286202 

But what I want is, to aggregate "all" data on a particular month for all
years and apply statistics on that aggregated data. Therefore I should get
only 12 values (for 12 months) not 17 values. Is there any way to do that?

Thanks,
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