Python numpy.sinc()用法及代码示例

numpy.sinc(array)：此数学函数可帮助用户计算所有x(作为数组元素)的sinc函数。

参数：
array: [array_like] elements are in radians. 2pi Radians = 36o degrees

返回：
An array with sinc value of x for all x i.e. array elements.

代码1：工作

# Python3 program explaining  
# sinc() function  
import numpy as np  
import math  
  
in_array = [0, math.pi / 2, np.pi / 3, np.pi]  
print ("Input array:\n", in_array)  
  
sinc_Values = np.sinc(in_array)  
print ("\nSinc values:\n", sinc_Values) 

输出：

Input array:
 [0, 1.5707963267948966, 1.0471975511965976, 3.141592653589793]

Sinc values:
 [ 1.         -0.19765087 -0.04490537 -0.04359863]

代码2：图形表示

# Python program showing Graphical  
# representation of sinc() function  
import numpy as np  
import matplotlib.pyplot as plt  
  
in_array = np.linspace(-np.pi, np.pi, 12)  
out_array = np.sinc(in_array)  
  
print("in_array:", in_array)  
print("\nout_array:", out_array)  
  
# red for numpy.sinc()  
plt.plot(in_array, out_array, color = 'red', marker = "o")  
plt.title("numpy.sinc()")  
plt.xlabel("X")  
plt.ylabel("Y")  
  
plt.show() 

输出：

in_array: [-3.14159265 -2.57039399 -1.99919533 -1.42799666 -0.856798   -0.28559933
  0.28559933  0.856798    1.42799666  1.99919533  2.57039399  3.14159265]

out_array: [-4.35986286e-02  1.20821077e-01 -4.02499006e-04 -2.17227951e-01
  1.61555129e-01  8.71125992e-01  8.71125992e-01  1.61555129e-01
 -2.17227951e-01 -4.02499006e-04  1.20821077e-01 -4.35986286e-02]