[R] Question about #1 zoo-faq

[Duncan Murdoch]

On 04/12/2010 5:40 AM, Alexander Salim wrote:
> Hi all,
>
> I have a zoo object issue. When I create a zoo object I have following error
> message: "some methods for 'zoo' objects do not work if the index entries in
> 'order.by' are not unique."
>
> I checked if I have some duplicates in the 'Time' column, R says yes, but
> when I check the data set I can't explain why. Here is the code.

Remember that duplicated() doesn't return TRUE for all copies, only the 
second (and later ones).  For example,

duplicated(c(1,1,2,2,1))

returns

[1] FALSE  TRUE FALSE  TRUE  TRUE

I believe the %in% operator works on zoo objects, so you can see all 
copies using

x <- with(dataSet1, Time %in% Time[duplicated(Time)])
dataSet1[x,]

Duncan Murdoch

>
>
>
>> sum(duplicated(dataSet1$Time))
>
> [1] 5
>
>> x<- which(duplicated(dataSet1$Time))
>
>> dataSet1[x,]
>
>                      Time fkl010z0 tre200s0 gre000z0 prestas0 rre150z0
> tde200s0 ure200s0
>
> 4046 2009-03-29 02:10:00      0.5      3.0        0    942.1        0
> 1.9     92.7
>
> 4047 2009-03-29 02:20:00      0.3      2.7        0    942.1        0
> 1.7     93.4
>
> 4048 2009-03-29 02:30:00      0.6      2.8        0    942.2        0
> 1.8     92.9
>
> 4049 2009-03-29 02:40:00      0.4      2.8        0    942.3        0
> 1.6     92.0
>
> 4050 2009-03-29 02:50:00      0.8      2.8        0    942.2        0
> 1.6     92.1
>
>>
>
>
>
> Enclosed is a dput file with the data set.
>
>
>
> Thank you for your help.
>
>
>
> Regards,
>
> Alex
>
>
>
>
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