# D. Scott
# Linear Algebra - Theory, Intuition, Code
# Code Challenge 3.3 - compute weighted mean

import numpy as np
import matplotlib.pyplot as plt

v1 = np.array([-6,4,2,8,12])

v2 = np.ones(5)

# say we desire to weight the fourth and second values:
v2[1] = 1.5
v2[3] = 2

print("New weights: ",v2)

print("Vector: ",v1)
print("Weighted average of values in vector: ",np.dot(v1,v2)/sum(v2))