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np.r_

import numpy as np
a = np.array([1, 2, 3])
b = np.array([4, 5, 6])
c = np.c_[a,b]

print(np.r_[a,b])
print(c)
print(np.c_[c,a])

[1 2 3 4 5 6]

[[1 4]
 [2 5]
 [3 6]]
 
[[1 4 1]
 [2 5 2]
 [3 6 3]]

Comment

python numpy r_

>>> np.r_[np.array([1,2,3]), 0, 0, np.array([4,5,6])]
array([1, 2, 3, ..., 4, 5, 6])
>>> np.r_[-1:1:6j, [0]*3, 5, 6]
array([-1. , -0.6, -0.2,  0.2,  0.6,  1. ,  0. ,  0. ,  0. ,  5. ,  6. ])

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np.r_

python numpy r_

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