Block tridiagonal matrix python

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With “regular” numpy arrays, using numpy.diag:

def tridiag(a, b, c, k1=-1, k2=0, k3=1):
    return np.diag(a, k1) + np.diag(b, k2) + np.diag(c, k3)

a = [1, 1]; b = [2, 2, 2]; c = [3, 3]
A = tridiag(a, b, c)

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