np.linspace主要用来创建等差数列。

np.linspace参数:

numpy.linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis=0)

• Return evenly spaced numbers over a specified interval.
  (在start和stop之间返回均匀间隔的数据)
• Returns num evenly spaced samples, calculated over the interval [start, stop].
  (返回的是 [start, stop]之间的均匀分布)
• The endpoint of the interval can optionally be excluded.
  Changed in version 1.16.0: Non-scalar start and stop are now supported.
  (可以选择是否排除间隔的终点)
  参数：

start:返回样本数据开始点
stop:返回样本数据结束点
num:生成的样本数据量，默认为50
endpoint：True则包含stop；False则不包含stop
retstep：If True, return (samples, step), where step is the spacing between samples.(即如果为True则结果会给出数据间隔)
dtype：输出数组类型
axis：0(默认)或-1

使用例子：

import numpy as np

a = np.linspace(1.0, 3.0, num=5)
print(a)
b = np.linspace(1, 3.0, num=5, endpoint=False)
print(b)
c = np.linspace(1, 3.0, num=5, retstep=True)
print(c)

输出：

[1.  1.5 2.  2.5 3. ]
[1.  1.4 1.8 2.2 2.6]
(array([1. , 1.5, 2. , 2.5, 3. ]), 0.5)