1回答

• 

  qq_不忘初心_206

  2018-04-08 16:56:00

  import numpy as np 

  from numpy.linalg import inv

  from numpy import dot

  from numpy import mat

  import pandas as pd 

  
  

  dataset = pd.read_csv('data.csv')

  print(dataset)

  
  

  temp = dataset.iloc[:,2:5] #iloc :对数组进行切片

  
  

  # X = mat([1,2,3]).reshape(3,1)

  # Y = 2*X

  # # theta = (X'X)^-1X'Y

  # #theta = dot(dot(inv(dot(X.T,X)), X.T),T)

  # #theta = theta - alpha*(theta*X-Y)*X

  
  

  # theta = 1.

  # alpha = 0.1

  # for i in range(100):

  # theta = theta + np.sum(alpha *(Y - dot(X,theta))*X.reshape(1,3))/3.#加权平均

  
  

  # print(theta

  
  

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