09-numpy-笔记-repeat

repeat：复制元素

 

axis = 0 复制每行

axis = 1 复制每列

2 表示复制一遍

不设置axis，复制每个，按行展开成一行。

 

>>> import numpy as np
>>> a = np.mat([[1,2,3],[4,5,6]])
>>> a
matrix([[1, 2, 3],
        [4, 5, 6]])
>>> a.repeat(2, axis = 0)
matrix([[1, 2, 3],
        [1, 2, 3],
        [4, 5, 6],
        [4, 5, 6]])
>>> a.repeat(2, axis = 1)
matrix([[1, 1, 2, 2, 3, 3],
        [4, 4, 5, 5, 6, 6]])
>>> a.repeat(2)
matrix([[1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6]])