Example explanation of python increasing the dimension of a matrix

numpy.expand_dims(a, axis)

Examples

>>> x = ([1,2])
>>> 
(2,)
>>> y = np.expand_dims(x, axis=0)
>>> y
array([[1, 2]])
>>> 
(1, 2)
>>> y = np.expand_dims(x, axis=1) # Equivalent to x[:,newaxis]
>>> y
array([[1],
    [2]])
>>> 
(2, 1)

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