【numpy】np.linespace() 函数

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

编写如下代码：

#!/usr/bin/python27
import numpy as np

x1 = np.linspace(1,10)
x2 = np.linspace(1,10,num = 10)
x3 = np.linspace(1,10,num = 10,retstep = True)
x4 = np.linspace(2,10,num = 10,endpoint = False)

print(x1)
print(x2)
print(x3)
print(x4)
print('---------------------------')
print("length of x1 is %d" % len(x1))
print("length of x2 is %d" % len(x2))
print("length of x2 is %d" % len(x3))
print("length of x2 is %d" % len(x4))

代码执行结果如下：

[ 1.          1.18367347  1.36734694  1.55102041  1.73469388  1.91836735
  2.10204082  2.28571429  2.46938776  2.65306122  2.83673469  3.02040816
  3.20408163  3.3877551   3.57142857  3.75510204  3.93877551  4.12244898
  4.30612245  4.48979592  4.67346939  4.85714286  5.04081633  5.2244898
  5.40816327  5.59183673  5.7755102   5.95918367  6.14285714  6.32653061
  6.51020408  6.69387755  6.87755102  7.06122449  7.24489796  7.42857143
  7.6122449   7.79591837  7.97959184  8.16326531  8.34693878  8.53061224
  8.71428571  8.89795918  9.08163265  9.26530612  9.44897959  9.63265306
  9.81632653 10.        ]
[ 1.  2.  3.  4.  5.  6.  7.  8.  9. 10.]
(array([ 1.,  2.,  3.,  4.,  5.,  6.,  7.,  8.,  9., 10.]), 1.0)
[2.  2.8 3.6 4.4 5.2 6.  6.8 7.6 8.4 9.2]
---------------------------
length of x1 is 50
length of x2 is 10
length of x2 is 2
length of x2 is 10

参数说明：

• start：scalar
  
  • 起始点
• stop：scalar
  
  • 终止点
• num : int, optional
  
  • Number of samples to generate. Default is 50. Must be non-negative.
  • 默认50，生成start和stop之间50个等差间隔的元素
• endpoint : bool, optional
  
  • If True, stop is the last sample. Otherwise, it is not included. Default is True.
  • 生成等差间隔的元素，但是不包含stop，即间隔为 （stop - start）/num
• retstep : bool, optional
  
  • If True, return (samples, step), where step is the spacing between samples.
  • 返回一个（array，num）元组，array是结果数组，num是间隔大小
• dtype : dtype, optional
  
  • The type of the output array. If dtype is not given, infer the data type from the other input arguments.
  • 输出数组的类型。如果没有给出dtype，则从其他输入参数推断数据类型。