numpy.repeat
numpy.repeat(a, repeats, axis=None)
Repeat elements of an array.
可以看出repeat函數是操作數組中的每一個元素，進行元素的複制。
例如：
>>> a = np.arange(3)
>>> a
array([0, 1, 2])
>>> np.repeat(a, 2)
array([0, 0, 1, 1, 2, 2])
>>> a = [[0,1], [2,3], [4,5]]
>>> y = np.repeat(a, 2)
>>> y
array([0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5])
numpy.tile
numpy.tile(A, reps)
Construct an array by repeating A the number of times given by reps.
可以看出tile函數是将數組A作為操作對象
例如：
>>> a = np.array([[1,2],[3,4]])
>>> a
array([[1, 2],
[3, 4]])
>>> np.tile(a, 2)
array([[1, 2, 1, 2],
[3, 4, 3, 4]])
>>> a = [[0,1], [2,3], [4,5]]
>>> x = np.tile(a, (2,1))
>>> x
array([[0, 1],
[2, 3],
[4, 5],
[0, 1],
[2, 3],
[4, 5]])