import matplotlib.pyplot as plt
import numpy as np 
N=8
y=np.zeros(N)
x1=np.linspace(0,10,N,endpoint=True)
x2=np.linspace(0,10,N,endpoint=False)
plt.plot(x1,y,'o')
plt.plot(x2,y+0.5,'o')
plt.ylim([-0.5,1])
plt.show()
