Pierre (19.08.2009 10:48): > Hello, > > I would like to know how to find the difference (set operation) > between 2 arrays : > > a = array([1,2, 3,2,5,2]) > b = array([1,2]) > I want a - b = [3,5] > What about set()? >>> a = set([1,2, 3,2,5,2]) >>> b = set([1,2]) >>> a.difference(b) set([3, 5]) Matthias