On Thu, 17 Mar 2005 08:11:11 GMT, rumours say that "Raymond Hettinger" <[EMAIL PROTECTED]> might have written:
>[Christos TZOTZIOY Georgiou] >> Anyway, a functional equivalent: >> >> .>> from itertools import starmap, izip >> .>> import operator >> .>> x= [1,2,3,4] >> .>> w=[3.0, 6.0, 9.0, 12.0] >> .>> sum(starmap(operator.mul, izip(x,w))) >> 90.0 > >Gack! starmap() is only for situations where the data is already in tuple >form. >If it inputs are already distinct, imap() is the preferred form. > >FWIW, the answer was already in the docs (itertools recipes): > > def dotproduct(vec1, vec2): > return sum(imap(operator.mul, vec1, vec2)) What, you're some kind of expert on itertools now? :-) You are of course absolutely correct. Let my post stand as an example of itertools misuse. -- TZOTZIOY, I speak England very best. "Be strict when sending and tolerant when receiving." (from RFC1958) I really should keep that in mind when talking with people, actually... -- http://mail.python.org/mailman/listinfo/python-list
