Python中的 numpy.sinc()
numpy.sinc(array)
:这个数学函数帮助用户计算所有 x(作为数组元素)的 sinc函数。
Parameters :
array : [array_like] elements are in radians. 2pi Radians = 36o degrees
Return :
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]