import matplotlib.pyplot as plt
import?numpy?as?np
def?plot_01():
? x1=np.array([152.6,310.6,463.6,625.9])
? y1=np.array([120.00,60.26,39.95,29.99])
? x2=np.array([156.2,332.8,501.6,678.0])
? y2=np.array([110.00,54.69,36.54,27.66])
? x3=np.array([177.9,371.0,558.2,753.3])
? y3=np.array([100.00,50.17,34.26,24.59])
? plot1,=plt.plot(x1,y1,'ro-')
? plot2,=plt.plot(x2,y2,'gs-')
? plot3,=plt.plot(x3,y3,'b*-')
? plt.title('relation?between?string?length,wave?length,and?frequency')
? plt.xlabel('frequency')
? plt.ylabel('wave?length')
plt.legend([plot1,plot2,plot3],['60cm','55cm','50cm'],loc="best")
? ?plt.show()
plot_01()
