[R] Why aren't row names in a data frame unique?

[Berend Hasselman]

On 06-03-2012, at 11:23, Ajay Askoolum wrote:

> 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.
> 

Look carefully at that example.
It is NOT providing rownames for a dataframe.
It IS providing row names for a matrix.

A matrix is not equal to a dataframe.

Berend