#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
print(np.zeros([2,3]),np.ones([2,2]))
# 改数，查数
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)
[1 2 3 4 5]
[[1 2]
[3 4]](5,) (2, 2)
[[ 0. 0. 0.]
[ 0. 0. 0.]] [[ 1. 1.]
[ 1. 1.]][[1 2]
[5 4]]4
[[ 2. 2. 2.]
[ 2. 2. 2.]][[ 0.33333333 0.33333333 0.33333333]
[ 0.33333333 0.33333333 0.33333333]][[ 3. 3. 3.]
[ 3. 3. 3.]][[ 2. 3. 4.]
[ 5. 6. 7.]][[ 1. 2. 3.]
[ 4. 5. 6.]]
