PYTHON

dot product of two vectors python

import numpy as np

# input: [[1,2,3,...], [4,5,6,...], ...]
def dot_product(vector, print_time= True):
    if print_time:
        print("----Dot Product----")
    dot_product = []
    for j in range(len(vector[0])):
        col = []
        for i in range(len(vector)):
            col.append(vector[i][j])
        prod_col = np.prod(col)
        dot_product.append(prod_col)
    sum_dot_product = np.sum(dot_product)
    
    if print_time:
        print(f"input vector: {vector}, => dot product = {sum_dot_product}")
        print("================================")
    return sum_dot_product
  
vector1 = [1,2,3]
vector2 = [4,5,6]
vector3 = [2,4,3]
vector4 = [2,4,3]
vector = [vector1, vector2, vector3, vector4]
  
dot_product(vector)
# or
dot_product([vector2, vector4])
# or
# the False parameter, disables the printing in the function.
print(dot_product(vector,False))