[R] Duplicated date values aren't duplicates

[jim holtman]

What you are reporting is that there are two duplicated dates in your
data.  'duplicated' returns a logical vector that is TRUE for the
second and subsequent duplicates.  Notice what is returned:

> x <- c(1,2,2,3,4,4,5,6,4,7,3)
> x[duplicated(x)]
[1] 2 4 4 3
>



On Thu, Jul 23, 2009 at 8:50 PM, Tim Clark<mudiver1200 at yahoo.com> wrote:
>
> Dear list,
>
> I just had a function (as.ltraj in Adehabitat) give me the following error:
>
> "Error in as.ltraj(xy, id, date = da) : non unique dates for a given burst"
>
> I checked my dates and got the following:
>
>>   dupes<-mydata$DateTime[duplicated(mydata$DateTime)]
>> dupes
> [1] (07/30/02 00:00:00) (08/06/03 17:45:00)
>
> Is there a reason different dates would come up as duplicate values?  I would prefer not to have to delete them if I don't have to.  Any suggestions on how to get R to realize they are different?
>
> Thanks,
>
> Tim
>
>
>
> Tim Clark
> Department of Zoology
> University of Hawaii
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?