Jim, have a look here:
http://www.r-bloggers.com/select-operations-on-r-data-frames/. Specifically at
the Duplicate Row Names section towards the end of the page.
________________________________
From: Jim Lemon <j...@bitwrit.com.au>
Cc: R General Forum <r-help@r-project.org>
Sent: Tuesday, 6 March 2012, 9:42
Subject: Re: [R] Why aren't row names in a data frame unique?
On 03/06/2012 06:42 PM, Ajay Askoolum wrote:
> I expected the row names to be unique but a data frame appears to be able to
> hold duplicate row names. This makes me thing that there must be
> circumstances when it is necessary. However, I cannot think of any. Please
> enlighten me.
>
Hi Ajay,
An example of how you managed to do this would be helpful. I tried it:
dodo<-data.frame(a=1:3,b=4:6)
dodo
 a b
1 1 4
2 2 5
3 3 6
rownames(dodo)<-c("s","t","s")
Error in `row.names<-.data.frame`(`*tmp*`, value = value) :
 duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique value when setting 'row.names': âsâ
Jim
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