[R] question on creating zoo object from indexed time series: re-arranges dates

[Gabor Grothendieck]

Not for me.

Please provide your data and code in reproducible form as per last
line of every r-help message and the posting guide.

> Lines <- "Date     Time Value
+ 01/01/13 00:00:00   1.6
+ 01/01/13 01:00:00   1.6
+ 01/01/13 02:00:00   1.6
+ 01/01/13 03:00:00   1.6
+ 01/01/13 04:00:00   1.6
+ 01/01/13 05:00:00   1.6
+ 01/01/13 06:00:00   1.6
+ 01/01/13 07:00:00   1.6
+ 01/01/13 08:00:00   1.6
+ 01/01/13 09:00:00   1.6"
> DF <- read.table(textConnection(Lines), header = TRUE, as.is = TRUE)
> library(zoo)
Warning message:
closing unused connection 3 (Lines)
> library(chron)
> z <- zoo(DF$Value, chron(DF$Date, DF$Time))
> z
(01/01/13 00:00:00) (01/01/13 01:00:00) (01/01/13 02:00:00) (01/01/13 03:00:00)
                1.6                 1.6                 1.6                 1.6
(01/01/13 04:00:00) (01/01/13 05:00:00) (01/01/13 06:00:00) (01/01/13 07:00:00)
                1.6                 1.6                 1.6                 1.6
(01/01/13 08:00:00) (01/01/13 09:00:00)
                1.6                 1.6


On Tue, Mar 30, 2010 at 3:32 PM, Christina Karamperidou
<ck4545 at gmail.com> wrote:
> Dear all,
>
> I have a time series of daily measurements that starts like this:
>
> KWhourly[1:10,]
>       Date     Time Value
> 01/01/13 00:00:00   1.6
> 01/01/13 01:00:00   1.6
> 01/01/13 02:00:00   1.6
> 01/01/13 03:00:00   1.6
> 01/01/13 04:00:00   1.6
> 01/01/13 05:00:00   1.6
> 01/01/13 06:00:00   1.6
> 01/01/13 07:00:00   1.6
> 01/01/13 08:00:00   1.6
> 01/01/13 09:00:00   1.6
>
> I am trying to get average daily, monthly, yearly values using the zoo package.
>
> My series starts at 01/01/13 00:00:00   and ends at   12/31/05 23:00:00
>
> I create the zoo object:
>
> #z <- zoo(KWhourly$Value,chron(KWhourly$Date, KWhourly$Time))
>
> but then z starts at:
> start(z)
> [1] (01/01/30 00:00:00)
>
> and ends at:
>
> end(z)
> [1] (12/31/29 23:00:00)
>
> instead of going from 01/01/13 to 12/31/05
>
> any ideas why this is happening and how to fix it?
>
> I really appreciate your help
>
>
> Christina K.
> Columbia University
> ck4545 at gmail.com
> P Please consider the environment - Do you really need to print this email?
>
>
>
>
>        [[alternative HTML version deleted]]
>
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>