Python中的 numpy.tanh()

numpy.tanh()是一个数学函数，可帮助用户计算所有 x（作为数组元素）的双曲正切。

等效于np.sinh(x) / np.cosh(x) or -1j * np.tan(1j*x) 。

Syntax : numpy.tanh(x[, out]) = ufunc ‘tanh’)
Parameters :

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

Return : An array with hyperbolic tangent of x for all x i.e. array elements

代码#1：工作

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

输出 ：

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

Tangent Hyperbolic values : 
 [ 0.          0.91715234  0.78071444  0.99627208]

代码 #2：图形表示

# Python program showing Graphical
# representation of tanh() function
import numpy as np
import matplotlib.pyplot as plt
  
in_array = np.linspace(-np.pi, np.pi, 12)
out_array = np.tanh(in_array)
  
print("in_array : ", in_array)
print("\nout_array : ", out_array)
  
# red for numpy.tanh()
plt.plot(in_array, out_array, color = 'red', marker = "o")
plt.title("numpy.tanh()")
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 :  [-0.99627208 -0.98836197 -0.96397069 -0.89125532 -0.69460424 -0.27807943
  0.27807943  0.69460424  0.89125532  0.96397069  0.98836197  0.99627208]

参考资料： https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.tanh.html#numpy.tanh
.