import numpy as np
>>> np.hstack(([1,2,3],[4,5,6]))
array([1, 2, 3, 4, 5, 6])
>>> np.vstack(([1,2,3],[4,5,6]))
array([[1, 2, 3],
[4, 5, 6]])
>>> np.column_stack(([1,2,3],[4,5,6]))
array([[1, 4],
[2, 5],
[3, 6]])
import numpy as np
>>> np.hstack(([1,2,3],[4,5,6]))
array([1, 2, 3, 4, 5, 6])
>>> np.vstack(([1,2,3],[4,5,6]))
array([[1, 2, 3],
[4, 5, 6]])
>>> np.column_stack(([1,2,3],[4,5,6]))
array([[1, 4],
[2, 5],
[3, 6]])
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