Rune Strand wrote: > itertools.izip is usually faster than zip. You can try that.
Thanks very much timing for itertools.izip for av, bv, cv, dv in itertools.izip(a, b, c, d): avbv = (av-bv) * (av - bv) diff = cv - dv e.append(diff - avbv) on a 4 million element aray: slice: 8.06299996376 built in zip: 36.5169999599 myzip: 12.0320000648 izip: 5.76499986649 so fastest overall -- http://mail.python.org/mailman/listinfo/python-list
