Unique for matrices

["Phil Corbett" <stpbk@warwick.ac.uk>]

Hi there

 

Say I have a matrix with 20 rows and three columns.  This matrix consists of four different vectors repeated a number of times (not all the same frequency).  Is there a function that I can apply to the matrix that will give me a smaller matrix that consists only of the four different vectors?

 

Thanks in advance

 

Phil Corbett