Python numpy implements array merge instances (vstack and hstack) and numpyvstack

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Python numpy implements array merge instances (vstack and hstack) and numpyvstack

Several Arrays can be combined along different axes for simple usage of vstack and hstack,

>>> a = np.floor(10*np.random.random((2,2)))>>> aarray([[ 8., 8.],    [ 0., 0.]])>>> b = np.floor(10*np.random.random((2,2)))>>> barray([[ 1., 8.],    [ 0., 4.]])>>> np.vstack((a,b))array([[ 8., 8.],    [ 0., 0.],    [ 1., 8.],    [ 0., 4.]])>>> np.hstack((a,b))array([[ 8., 8., 1., 8.],    [ 0., 0., 0., 4.]])

The column_stack function converts a 1D array into a 2D array, which is equivalent to vertically arranging 1D arrays.

>>> from numpy import newaxis>>> np.column_stack((a,b))  # With 2D arraysarray([[ 8., 8., 1., 8.],    [ 0., 0., 0., 4.]])>>> a = np.array([4.,2.])>>> b = np.array([2.,8.])>>> a[:,newaxis] # This allows to have a 2D columns vectorarray([[ 4.],    [ 2.]])>>> np.column_stack((a[:,newaxis],b[:,newaxis]))array([[ 4., 2.],    [ 2., 8.]])>>> np.vstack((a[:,newaxis],b[:,newaxis])) # The behavior of vstack is differentarray([[ 4.],    [ 2.],    [ 2.],    [ 8.]])

For multi-dimensional arrays, hstack follows the second axis and vstack follows the first axis.

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