Wolfgang, thank you very much for your reply. Following the example in the link, the problem appears:
>>> A = [[0]*2]*3
>>> A
[[0, 0], [0, 0], [0, 0]]
>>> A[0][0] = 5
>>> A
[[5, 0], [5, 0], [5, 0]]
Now, if I use a numpy array:
>>> d=array([[0]*2]*3)
>>> d
array([[0, 0],
[0, 0],
[0, 0]])
>>> d[0][0]=5
>>> d
array([[5, 0],
[0, 0],
[0, 0]])
What is the difference here?
Thank you,
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