Python中numpy模块的简单使用

 # encoding:utf-8

 import numpy as np

 data1 = np.array([1, 2, 3, 4, 5])

 print(data1)

 data2 = np.array([[1, 2],

                   [3, 4]])

 print(data2)

 # 矩阵的维度

 print(data1.shape, data2.shape)

 # 全零矩阵和全一矩阵

 print(np.zeros([2,3]), np.ones([2,2]))

 # 更改矩阵中的元素

 data2[1, 0] = 5

 print(data2)

 # 查看矩阵元素的值

 print(data2[1, 1])

 # 矩阵的点乘、点除、对应相加和对应相减

 data3 = np.ones([2, 3])

 print(data3*2)  # 对应相乘

 print(data3/3)

 print(data3+2)

 print(data3-2)

 # 矩阵+和*

 data4 = np.array([[1, 2, 3], [4, 5, 6]])

 print(data3+data4)

 print(data3*data4)