add a new column to numpy array

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Josefina
08 Feb 2019
1np.concatenate((np.zeros((3,3), dtype=int), arr), axis=1)
2array([[0, 0, 0, 1, 2, 3],
3       [0, 0, 0, 4, 5, 6],
4       [0, 0, 0, 7, 8, 9]])
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Keri
27 Jul 2018
1import numpy as np
2N = 10
3a = np.random.rand(N,N)
4b = np.zeros((N,N+1))
5b[:,:-1] = a
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