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pythonnumpyoperation

Dot Product in Python without NumPy

Is there a way that you can preform a dot product of two lists that contain values without using NumPy or the Operation module in Python? So that the code is as simple as it could get?

For example:

V_1=[1,2,3]
V_2=[4,5,6]

Dot(V_1,V_2)

Answer: 32

Solution

  • Without numpy, you can write yourself a function for the dot product which uses zip and sum.

    >>> def dot(v1, v2):
...     return sum(x*y for x, y in zip(v1, v2))
... 
>>> dot([1, 2, 3], [4, 5, 6])
32

    As of Python 3.10, you can use zip(v1, v2, strict=True) to ensure that v1 and v2 have the same length.