On Fri, 26 Nov 2004, kevin lester apparently wrote: > equality test for arrrays of unequal lengths ... > a = array([19289 19291 19299 ..., 21966 21978 21990]) > b = array([ 0 1 2 ..., 95956 95717 95768]) What does the result you want look like? If you just want the set of shared elements, try the set module. hth, Alan Isaac