R help - Jan 2012 - Finding Source of Error Message of 'Non-Unique Index Entries'

I have a situation that I cannot resolve by myself. When I try to create a
zoo object (with read.zoo() ) I get this error:

Error in merge.zoo(`BC-0.5 = c("   0.000", "   0.010",
"   0.010", "
0.060",  :
   series cannot be merged with non-unique index entries in a series

   This suggests that there is a duplicate entry for the factor BC-0.5 on a
given date. Because the data originate in a relational database table with
a multi-column primary key there are no duplicate rows in the table, or the
text file copied from that table. I need to find the source of this error.

   How can I identify the non-unique index entries within R?

Rich

On Jan 3, 2012, at 11:45 AM, Rich Shepard wrote:
>  I have a situation that I cannot resolve by myself. When I try to  
> create a
> zoo object (with read.zoo() ) I get this error:
>
> Error in merge.zoo(`BC-0.5 = c("   0.000", "   0.010",
"   0.010", "
> 0.060",  :
>  series cannot be merged with non-unique index entries in a series
>
>  This suggests that there is a duplicate entry for the factor BC-0.5  
> on a
> given date. Because the data originate in a relational database  
> table with
> a multi-column primary key there are no duplicate rows in the table,  
> or the
> text file copied from that table. I need to find the source of this  
> error.
>
>  How can I identify the non-unique index entries within R?
?duplicated

-- 
David Winsemius, MD
West Hartford, CT