# -*- coding: utf-8 -*-"""Created on Tue May 22 15:56:56 2018@author: dell"""import numpy as npclass Perceptron(object): def __init__(self,eta=0.01,n_iter=10): self.eta=eta; self.n_iter=n_iter pass def fit(self,X,y): self.w_=np.zero(1+x.shape[1]); self.errors_=[] for _ in range(self,n_iter): errors_=0 for Xi,target in zip(x,y): update=self.eta*(target-self.predict(Xi)) self.w_[1:]+=update*Xi self.w_[0]+=update; errors+=int(update!=0.0) self.errors_.append(errors) pass pass def net_input(self,X): return np.dot(x,self.w_[1:])+self.w_[0] pass def predict(self,x): return np.where(self.net_input(x)>=0.0,1,-1) pass passfile="iris.date.csv.txt"import pandas as pddf=pd.read_csv(file,header=None)import matplotlib.pyplot as pltimport numpy as npy=df.loc[:100,4].valuesy=np.where(y=='Iris-setosa',-1,1)print (y)X=df.iloc[:100,[0,2]].valuesprint (X)plt.scatter(X[:50,0],X[:50,1],color='red',marker='o',label='setosa')plt.scatter(X[50:100,0],X[50:100,1],color='blue',marker='x',label='versicolor')plt.xlabel('花瓣长度')plt,ylabel('花径长度') plt,legend(loc='upper left')plt.show() 请问为什么画出来的图没有x,y轴坐标含义?且没有图例学习视频里面画出的图是这样的我却弄不出来
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