python 之 nympy分割

分割：

import numpy as np
a = np.arange(12).reshape((3,4))#创建一个矩阵
print(a)
print(np.split(a,3,axis = 0 ))#分割矩阵，按行分成三份
print(np.array_split(a,3,axis=1))#不均等分割，将4列分成三份
print(np.vsplit(a,3))#横向分成三块
print(np.hsplit(a,2))#纵向分成两块

运行结果如下：

[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

[array([[0, 1, 2, 3]]), array([[4, 5, 6, 7]]), array([[ 8,  9, 10, 11]])]

[array([[0, 1],
       [4, 5],
       [8, 9]]), array([[ 2],
       [ 6],
       [10]]), array([[ 3],
       [ 7],
       [11]])]

[array([[0, 1, 2, 3]]), array([[4, 5, 6, 7]]), array([[ 8,  9, 10, 11]])]

[array([[0, 1],
       [4, 5],
       [8, 9]]), array([[ 2,  3],
       [ 6,  7],
       [10, 11]])]