1 # encoding:utf-8
2
3 import numpy as np
4 data1 = np.array([1, 2, 3, 4, 5])
5 print(data1)
6 data2 = np.array([[1, 2],
7 [3, 4]])
8 print(data2)
9 # 矩阵的维度
10 print(data1.shape, data2.shape)
11 # 全零矩阵和全一矩阵
12 print(np.zeros([2,3]), np.ones([2,2]))
13 # 更改矩阵中的元素
14 data2[1, 0] = 5
15 print(data2)
16 # 查看矩阵元素的值
17 print(data2[1, 1])
18 # 矩阵的点乘、点除、对应相加和对应相减
19 data3 = np.ones([2, 3])
20 print(data3*2) # 对应相乘
21 print(data3/3)
22 print(data3+2)
23 print(data3-2)
24 # 矩阵+和*
25 data4 = np.array([[1, 2, 3], [4, 5, 6]])
26 print(data3+data4)
27 print(data3*data4)
