[ublas] Distinct rows in a matrix

Subject: [ublas] Distinct rows in a matrix
From: Pawe³ Szlendak (ogee_at_[hidden])
Date: 2008-10-30 11:24:48

Greetings!

I've been recently wondering how to check how many unique rows a matrix 
is made of?
To be more specific, having a matrix

                A = [1 2 3; 4 5 6; 1 2 3]

I want to evaluate how many distinct rows it contains. In this simple 
example the answer should be:

             2 distinct rows  ->  [1 2 3], [4 5 6]

Is there some simple way to achieve this with ublas? I would like to 
avoid having to iterate over each row and compare its contents with all 
other rows. Is there some
built-in row comparison facility?
Any ideas?

Thanks,

Pawe³