python画两条曲线_python 实现将多条曲线画在一幅图上的方法

如下所示：

# -*- 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", dpi=600))

plt.show()

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