python-matplotlib绘图示例

import numpy as np import matplotlib.pyplot as plt a = 1 b = 0.5 m = 0.6 x = np.linspace(0,6,1000) y1 = (-2*a*m*x*(80+81*x)+pow(m,2)*(320+368*x+81*pow(x,2)) + pow(a,2)*(400 + 440*x + 81*pow(x,2)))/(b*pow((40 + 27*x),2)) y2 = (4*a*m*x*(82+81*x)+4*pow(m,2)*(64+148*x+81*pow(x,2)) + pow(a,2)*(25 + 81*x)*x)/(b*pow((40 + 27*x),2)) y3 = (2*pow((5*a + 4*m),2)*x)/(b*pow(40+27*x,2)) plt.figure() plt.plot(x,y1,color = "red",linewidth = 1,linestyle = "-",label = "Competitive Supplier") plt.plot(x,y2,color = "blue",linewidth = 1,linestyle = "-",label = "OEM") plt.plot(x,y3,color = "black",linewidth = 1,linestyle = "-",label = "Non-competitive Supplier") plt.legend(loc = "upper left") plt.xlabel("X") plt.xlim(0,5) plt.ylim(0,0.8) plt.ylabel("Profit") plt.xticks([0,1,2,3,4,5]) plt.yticks([0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8]) plt.show()