2-17 numpy模块使用

 

#CURD
import numpy as np
data1 = np.array([1,2,3,4,5])
print(data1)
data2 = np.array([[1,2],
                  [3,4]])
print(data2)
#维度
print(data1.shape,data2.shape)
# zero ones 空矩阵 单位矩阵 
print(np.zeros([2,3]),np.ones([2,2]))
# 改查
data2[1,0] = 5
print(data2)
print(data2[1,1])
# 基本运算
data3 = np.ones([2,3])
print(data3*2)# 对应相乘
print(data3/3)
print(data3+2)
# 矩阵+*
data4 = np.array([[1,2,3],[4,5,6]])
print(data3+data4)
print(data3*data4)