python 实现将多条曲线画在一幅图上的方法

 # -*- coding: utf-8 -*- """ Created on Thu Jun 07 09:17:40 2018 @author: yjp """ import matplotlib.pyplot as plt import numpy as np from matplotlib.ticker import MultipleLocator, FormatStrFormatter y0 = [] y1 = [] y2 = [] y3 = [] y4 = [] f = open("y0.txt") lines = f.readlines() for li in lines: y0.append(li) f = open("y1.txt") lines = f.readlines() for li in lines: y1.append(li) f = open("y2.txt") lines = f.readlines() for li in lines: y2.append(li) f = open("y3.txt") lines = f.readlines() for li in lines: y3.append(li) f = open("y4.txt") lines = f.readlines() for li in lines: y4.append(li) font1 = {'family' : 'Times New Roman', 'weight' : 'normal', 'size'  : 9, } font2 = {'family' : 'Times New Roman', 'weight' : 'normal', 'size'  : 14, } figsize = 8, 9 plt.subplots(figsize=figsize)                # 设定整张图片大小 ax1 = plt.subplot(4, 1, 1) ax1.yaxis.set_major_locator(MultipleLocator(15))       # 设定y轴刻度间距 #第一条线 x = range(0, len(y0)) plt.plot(x, y0, color='black', label='$DT$', linewidth=0.8) # 绘制，指定颜色、标签、线宽，标签采用latex格式 plt.ylim(-90, -20)                      # 设定y轴范围 hl=plt.legend(loc='upper right', prop=font1, frameon=False)                # 绘制图例，指定图例位置 #set(hl,'Box','off'); #第二条曲线 x = range(0, len(y1)) plt.plot(x, y1, color='red', label='$M_1$', linewidth=0.8) plt.legend(loc='upper right', prop=font1, frameon=False)                # 绘制图例，指定图例位置 plt.xticks([])                        # 去掉x坐标轴刻度 plt.xlim(0, 580)                       # 设定x轴范围 ax2 = plt.subplot(4, 1, 2) ax2.yaxis.set_major_locator(MultipleLocator(15)) x = range(0, len(y0)) plt.plot(x, y0, color='black', label='$DT$', linewidth=0.8) plt.ylim(-90, -20) hl=plt.legend(loc='upper right', prop=font1, frameon=False) #set(hl,'Box','off'); x = range(0, len(y2)) plt.plot(x, y2, color='red', label='$M_2$', linewidth=0.8) plt.legend(loc='upper right', prop=font1, frameon=False) plt.ylabel("strength/dBm", font2) plt.xticks([]) plt.xlim(0, 580) ax3 = plt.subplot(4, 1, 3) ax3.yaxis.set_major_locator(MultipleLocator(15)) x = range(0, len(y0)) plt.plot(x, y0, color='black', label='$DT$', linewidth=0.8) hl=plt.legend(loc='upper right', prop=font1, frameon=False) #set(hl,'Box','off'); plt.ylim(-90, -20) x = range(0, len(y3)) plt.plot(x, y3, color='red', label='$M_3$', linewidth=0.8) plt.legend(loc='upper right', prop=font1, frameon=False) plt.xticks([]) plt.xlim(0, 580) ax4 = plt.subplot(4, 1, 4) ax4.yaxis.set_major_locator(MultipleLocator(15)) ax4.xaxis.set_major_locator(MultipleLocator(50)) x = range(0, len(y0)) plt.plot(x, y0, color='black', label='$DT$', linewidth=0.8) plt.ylim(-90, -20) hl=plt.legend(loc='upper right', prop=font1, frameon=False) #set(hl,'Box','off'); x = range(0, len(y4)) plt.plot(x, y4, color='red', label='$M_4$', linewidth=0.8) plt.legend(loc='upper right', prop=font1, frameon=False) plt.xlabel("index of grids in path", font2) plt.xlim(0, 580) plt.savefig("1.png-600", dpi=600)) plt.show()