Dot product?

David C. Ullrich ullrich at math.okstate.edu
Sun Dec 12 14:39:14 EST 1999


Berthold Höllmann wrote:

> "David C. Ullrich" <ullrich at math.okstate.edu> writes:
>
> >     Ok, so I'm dense.

[...]

> How about:
>
> def Dot(X, Y):
>     res = 0.
>     for (x,y) in map(None, X, Y):
>         res = res + x * y
>     return res

    Aha - I knew there must be something I was missing, thanks.
I would never guessed that that's what map(None, X, Y) would
do. Let's see... nope, I got no excuse, all explained clearly in the
docs under "map". I didn't realize that map could take more than
one parameter.

    Exactly what I was hoping to find, thanks.

DU




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