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2006 Jul 24
3
unique, but keep LAST occurence
?unique says
Value:
An object of the same type of 'x'. but if an element is equal to
one with a smaller index, it is removed.
However, I need to keep the one with the LARGEST index.
Can someone please show me the light?
I thought about reversing the row order twice, but I couldn't get it to work right
(My data frame has 125000 rows and 7 columns,
and I'm