numpy array row major and column major

by

The numpy stores data in row major order.

>>> a = np.array([[1,2,3,4], [5,6,7,8]])
>>> a.shape
(2, 4)
>>> a.shape = 4,2
>>> a
array([[1, 2],
       [3, 4],
       [5, 6],
       [7, 8]])

If you change the shape, the order of data do not change.

If you add a ‘F’, you can get what you want.

>>> b
array([1, 2, 3, 4, 5, 6])
>>> c = b.reshape(2,3,order="F")
>>> c
array([[1, 3, 5],
       [2, 4, 6]])

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