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)