吴恩达ex1——多元线性回归实现

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

#读取数据
df=pd.read_csv('ex1data2.txt',header=None,
               names=['siez of housing ','numbers of bedroom','house price'])
df.head()

	siez of housing	numbers of bedroom	house price
0	2104	3	399900
1	1600	3	329900
2	2400	3	369000
3	1416	2	232000
4	3000	4	539900

#标准化
df=(df-df.mean())/df.std()
df.head()

	siez of housing	numbers of bedroom	house price
0	0.130010	-0.223675	0.475747
1	-0.504190	-0.223675	-0.084074
2	0.502476	-0.223675	0.228626
3	-0.735723	-1.537767	-0.867025
4	1.257476	1.090417	1.595389

X=df.iloc[:,0:2].values
X.shape

(47, 2)

X=np.insert(X,0,1,axis=1)

X=np