AttributeError: 'module' object has no attribute 'block'

Linear Algebra
1

Hi Community,
I have faced a weird error I am trying to assemble my stiffness matrix through np.block which is work normally by running my script through my terminal but when I’m using that inside a fenics script this issue occurs.
Here I provide a simple examples of np.block:

import numpy as np
A = np.eye(2) * 2
B = np.eye(3) * 3
C = np.block([
[A, np.zeros((2, 3))],
[np.ones((3, 2)), B ]])
print(‘assembeled matrix =’, C)

I can get matrix C if I don’t use fenics and simply run the above lines.
But when I call fenics and then try to run this script this error occurs:

AttributeError: ‘module’ object has no attribute ‘block’

I appreciate any hint in this case.

2

I’m not able to reproduce this error, but is it possible that the environment you’re running FEniCS in has an older version of NumPy, which doesn’t have block?

1 Like
3

Hi David,

Thanks for your response, yes my NumPy version didn’t support block (It was 1.11) and I upgrade that to 1.16.4 which is working fine.

Bests,
Ali