numpy.linspace 生成等差数组的方法

numpy.linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None)

import numpy as np

x1 = np.linspace(2.0, 3.0, num=5)
print x1
x2 = np.linspace(2.0, 3.0, num=5, endpoint=False)
print x2
x3 = np.linspace(2.0, 3.0, num=5, retstep=True)
print x3

[ 2. 2.25 2.5 2.75 3. ] 
[ 2. 2.2 2.4 2.6 2.8] 
(array([ 2. , 2.25, 2.5 , 2.75, 3. ]), 0.25)

import numpy as np
import matplotlib.pyplot as plt

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()