[R] shift/lag when merge zoo

[j.k]

Worked perfect...
Thanks a lot!

Johannes


j.k wrote:
> 
> Hello alltogheter,
> I have a little problem regarding merging to zoo series.
> I want to merge two zoo series to reduce the timegaps between the stamps.
> I use the following code:
> 
> data.test <-
> as.POSIXct(seq(data.input01[1,1],data.input01[nrow(data.input01),1],900),tz="GMT")
> data.troughput01 <- as.zoo(data.input01$V2)
> index(data.troughput01) <- as.POSIXct(data.input01$V1,tz="GMT")
> data.output01 <-merge(data.troughput01,zoo(,data.test))
> 
> They look like that:
> 
> head(data.test)
> [1] "2008-01-01 00:00:00 GMT" "2008-01-01 00:15:00 GMT" "2008-01-01
> 00:30:00 GMT"
> [4] "2008-01-01 00:45:00 GMT" "2008-01-01 01:00:00 GMT" "2008-01-01
> 01:15:00 GMT"
> 
>> head(data.troughput01)
> 2008-01-01 00:00:00 2008-01-01 00:30:00 2008-01-01 01:00:00 2008-01-01
> 01:30:00 
>            12.24180            11.27340            10.30500            
> 9.33654 
> 2008-01-01 02:00:00 2008-01-01 02:30:00 
>             8.36811             7.62456 
> 
>> head(data.output01)
> 2008-01-01 01:00:00 2008-01-01 01:15:00 2008-01-01 01:30:00 2008-01-01
> 01:45:00 
>             12.2418                  NA             11.2734                 
> NA 
> 2008-01-01 02:00:00 2008-01-01 02:15:00 
>             10.3050                  NA 
> 
> 
> Are there any ideas why I have a lag of one hour?
> 
> At last I fill the NAs with na.approx:
> 
> data.output01 <-merge(data.troughput01,zoo(,data.test))
> 
>> head(data.output01)
> 2008-01-01 01:00:00 2008-01-01 01:15:00 2008-01-01 01:30:00 2008-01-01
> 01:45:00 
>            12.24180            11.75760            11.27340           
> 10.78920 
> 2008-01-01 02:00:00 2008-01-01 02:15:00 
>            10.30500             9.82077 
>> 
> 
> Maybe there are suggestions for other solutions of achieving the increase
> of the resolution.
> 
> Thanks in advance
> Johannes
> 
> 

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