On Tue, 8 Dec 2009, Bogaso wrote:
Hi all, I would like to ask how to order a Zoo object? Consider following
code
dat <- zooreg(rnorm(5), as.yearmon(as.Date("2001-01-01")), frequency=12)
dat
Jan 2001 Feb 2001 Mar 2001 Apr 2001 May 2001
-0.8916124 -0.4516505 1.1305884 -1.4881309 0.3703734
Here I want to order from last to 1st i.e. from May to Jan. So I used
following code :
dat[5:1]
Jan 2001 Feb 2001 Mar 2001 Apr 2001 May 2001
-0.8916124 -0.4516505 1.1305884 -1.4881309 0.3703734
Therefore I am not getting what I desired. If someone points out the correct
code I would be grateful.
The zoo object itself is always ordered by time. So it takes the
observations you specified (5:1) and orders them by time again (so you get
1:5). You need to extract the data without the time index and then proceed
as usual:
sort(coredata(dat))
or
coredata(dat)[5:1]
etc.
Z
Thanks,
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