numpy.repeat(a, repeats, axis=None)
>>> 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])
>>> x = np.tile(a, (2,1))
>>> x
array([[0, 1],
[2, 3],
[4, 5],
[0, 1],
[2, 3],
[4, 5]])
>>> a = np.array([[1,2],[3,4]])
>>> a
array([[1, 2],
[3, 4]])
>>> np.repeat(a, 2, 1)
array([[1, 1, 2, 2],
[3, 3, 4, 4]])
>>> np.repeat(a, 2, 0)
array([[1, 2],
[1, 2],
[3, 4],
[3, 4]])
tile函数功能:对整个数组进行复制拼接
>>> a
array([[1, 2],
[3, 4]])
>>> np.tile(a, 2)
array([[1, 2, 1, 2],
[3, 4, 3, 4]])
#构造3*1个copy
>>> a = np.tile(a, (3, 1))
>>> a
array([[1, 2],
[3, 4],
[1, 2],
[3, 4],
[1, 2],
[3, 4]])