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

[Rich Shepard]

On Tue, 3 Jan 2012, David Winsemius wrote:

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

   Thank you, David.

   I _think_ the problem comes from a duplated factor column in the data
frame. Now I need to figure out how subset() generated that additional
column.

Regards,

Rich