ValueError could not broadcast input array from shape 4 1 into shape 4

0 votes
This code produces this error of broadcasting and I don't understand why. N is a number, C is a matrix 4x4, xvec_tra an array 4x1 and the result x should be a matrix 4xN.

x=np.zeros(shape=(4,int(N)), dtype=np.float64)
for i in range(0, int(N/2)):
    if i == 0:   
        x[:,0]=C * xvec_tra
        print(x[:,0])
else:
    x[:,i]=C*x[:,i-1]
    print(x[:,i])
Feb 13, 2020 in Python by Giorgio
• 120 points
7,631 views

1 answer to this question.

0 votes

Hey @Giorgio,

You can try this hope this will resolve your error.

import numpy as np

N=0

C=0

x=np.zeros(shape=(4,int(N)), dtype=np.float64)

for i in range(0, int(N/2)):

    if i == 0:   

        x[:,0]=C * xvec_tra

        print(x[:,0])

    else:

      x[:,i]=C*x[:,i-1]

      print(x[:,i])

print(N)
answered Feb 18, 2020 by Gitika
• 65,910 points

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