[R] Weird POSIXct behaviour

[peter dalgaard]

I see "NZDT" going in and out of your time values. Could that have something to do with it?

On Mar 25, 2012, at 10:15 , Worik R wrote:

> Friends
> 
> I have an xts that I wish to access.
> 
> Browse[2]> DATA.ba[[p]]["2012-03-20 00:59:57","bid"]
>                       bid
> 2012-03-20 00:59:57 1.4993
> 
> So far so good.
> 
> Now putting the index into a variable:
> 
> Browse[2]> Time
> [1] "2012-03-20 00:59:57 NZDT"
> Browse[2]> DATA.ba[[p]][Time, "bid"]
>     bid
> 
> Where has it gone?
> 
> 
> Looking closer....
> 
> 
> Browse[2]> index(DATA.ba[[p]]["2012-03-20 00:59:57","bid"])
> [1] "2012-03-20 00:59:57 NZDT"
> Browse[2]>
> 
> Browse[2]> Time
> [1] "2012-03-20 00:59:57 NZDT"
> Browse[2]>
> 
> Browse[2]> index(DATA.ba[[p]]["2012-03-20 00:59:57","bid"]) == Time
> [1] FALSE
> Browse[2]>
> 
> Browse[2]> class(Time)
> [1] "POSIXct" "POSIXt"
> 
> Browse[2]> class(index(DATA.ba[[p]]["2012-03-20 00:59:57","bid"]))
> [1] "POSIXct" "POSIXt"
> 
> So the variable 'Time' should be good to index DATA.ba[[p]].  I am
> hopelessly confused.
> 
> cheers
> Worik
> 
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> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com