python函数绘制简单的曲线图像

样例一：

import matplotlib
import matplotlib.pyplot as plt
import numpy
import math
from pylab import *

x = numpy.linspace(-4,4,200)
f1 = numpy.power(10,x)
f2=numpy.power(math.e,x)
f3 = numpy.power(2,x)

plt.plot(x,f1,'r',x,f2,'b',x,f3,'g',linewidth=2)
plt.axis([-4,4,-0.5,8])
plt.text(1,7.5,r'$10^x$',fontsize=16)
plt.text(2.2,7.5,r'$e^x$',fontsize=16)
plt.text(3.2,7.5,r'$2^x$',fontsize=16)
plt.title('A simple example',fontsize=16)

savefig('power.png',dpi=75)
show()

样例二

绘制s函数

import matplotlib
import matplotlib.pyplot as plt
import numpy
import math
from pylab import *

x = numpy.linspace(-10,10,200)
f4 = numpy.power(math.e,-x)
f5 = 1/(1+f4)

plt.plot(x,f5,'g',linewidth=2)
plt.axis([-10,10,-0.5,1.5])

plt.title('A simple example',fontsize=16)

savefig('power.png',dpi=75)
show()

本文地址：https://blog.csdn.net/weixin_45839124/article/details/107361261