dot product in python

python dot-product

user458858 · Nov 4, 2010 · Viewed 57.7k times · Source

Does this Python code actually find the dot product of two vectors?

import operator

vector1 = (2,3,5)
vector2 = (3,4,6)
dotProduct = reduce( operator.add, map( operator.mul, vector1, vector2))

Answer

Yes it does. Here is another way

>>> sum(map( operator.mul, vector1, vector2))
48

and another that doesn't use operator at all

>>> vector1 = (2,3,5)
>>> vector2 = (3,4,6)
>>> sum(p*q for p,q in zip(vector1, vector2))
48