Make special diagonal matrix in Numpy

Question

I am trying to make a numpy array that looks like this:

[a b c       ]
[  a b c     ]
[    a b c   ]
[      a b c ] 

So this involves updat

Answer 1

This is an example of a Toeplitz matrix - you can construct it using scipy.linalg.toeplitz:

import numpy as np
from scipy.linalg import toeplitz

first_row = np.array([1, 2, 3, 0, 0, 0])
first_col = np.array([1, 0, 0, 0])

print(toeplitz(first_col, first_row))
# [[1 2 3 0 0 0]
#  [0 1 2 3 0 0]
#  [0 0 1 2 3 0]
#  [0 0 0 1 2 3]]