[R] Finding Source of Error Message of 'Non-Unique Index Entries' [FIXED]

[David Winsemius]

On Jan 4, 2012, at 3:21 PM, Rich Shepard wrote:

> On Wed, 4 Jan 2012, David Winsemius wrote:
>
>> Nothing attached. I don't know what you entitled teh "compressed  
>> dput output" but it did not pass the filters of the mailserver and  
>> you did not copy me.
>
> David,
>
>  It must have been stripped off as too large (14K).
>
>  Regardless, I solved the problem:
>
>  The examples in the subset help page show only a single row criterion
> being used, but does not explicitly note that rows can be selected  
> only one
> criterion at a time.

Because that is simply not true. Connect your criteria with ampersands  
and you can have as many as you want. The only requirement is that the  
logical vector that results be exactly the number of rows in the  
dataframe .... as described in the help page.

>
>  Because the issue showed up only with the subset() function to  
> extract
> rows with the parameter TDS, the problem had to be in that syntax. By
> changing the data frame argument to subset() from the overall  
> chemdata to
> that of only a single stream, creation of the zoo object threw no  
> errors and
> duplicated() returned zero rows.
>
>  Wow! And I thought I understood the subset() syntax. I now do!
>
> Thanks to you, Gabor, and everyone else who responded to this thread,
>
> Rich
>
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David Winsemius, MD
West Hartford, CT