plt曲线论文格式

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

 
plt.rcParams['font.sans-serif']=['SimHei'] #用来正常显示中文标签
plt.rcParams['axes.unicode_minus'] = False #用来正常显示负号
data = pd.read_excel('xlsx')
x = data['次数']
y_tanh01 = data['tanh0.01']
y_tanh005 = data['tanh0.005']
y_01 = data['三次0.01']
y_005 = data['三次0.005']

plt.xlabel(u'迭代次数') # 这一段
plt.ylabel(u'总离差') # 这一段
plt.plot(x,y_tanh01,label = '优化过程(tanh,0.01)', linewidth=0.8,linestyle="--",color = 'black')
plt.plot(x,y_tanh005,label = '优化过程(tanh,0.005)' , linewidth=0.8,linestyle="-",color = 'black')
plt.plot(x,y_01,label = '优化过程(立方差,0.01)', linewidth=0.8,linestyle="dotted",color = 'black' )
plt.plot(x,y_005,label = '优化过程(立方差,0.005)' , linewidth=0.8,linestyle = "-.",color = 'black')
legend = plt.legend(loc='upper right',fontsize =8,frameon = True)
#plt.show()
plt.savefig('画图.png',transparent=False,dpi=500,pad_inches = 0,bbox_inches='tight')