Prerequisite:

先決條件：

• Defining a Vector

  定義向量

• Defining a Matrix

  定義矩陣

Numpy is the library of function that helps to construct or manipulate matrices and vectors. The function numpy.tanh(x) is a function used for generating a matrix / vector / variable with the Tangent Hyperbolic value of b x (as tanh(x)).

Numpy是一個功能庫，可幫助構造或操縱矩陣和向量。 函數numpy.tanh(x)是用于生成正切雙曲值為b x的矩陣/向量/變量(作為tanh(x) )的函數 。

Syntax:

句法：

    numpy.tanh(x)

Input parameter(s):

輸入參數：

• x – could be a matrix or vector or a variable.

  x –可以是矩陣，向量或變量。

Return value:

返回值：

A Matrix or vector or a variable of the same dimensions as input x with tanh(x) values (between 0 and 1) at each entry.

與輸入x尺寸相同的矩陣或向量或變量，每個條目處具有tanh(x)值(介于0和1之間)。

Applications:

應用范圍：

1. Machine Learning

   機器學習

2. Neural Network

   神經網絡

Python代碼將向量/矩陣元素的雙曲正切值 (Python code to hyperbolic tangent value of vector/matrix elements)

# Linear Algebra Learning Sequence
# Printing hyperbolic tangent value of 
# vector/matrix elements using numpy.tanh()
import numpy as np
#Use of np.array() to define an Vector
V = np.array([323,.623,823])
print("The Vector A : ",V)
VV = np.array([[3,63,.78],[.315,32,42]])
print("\nThe Vector B : \n",VV)
pro = V.dot(VV.T)
print("\nProduct of two vectors : ", pro)
print("\ntanh(AB) : ", np.tanh(pro))
print("\ntanh(A) : ", np.tanh(V))
print("\ntanh(B) : \n", np.tanh(VV))

Output:

輸出：

The Vector A :  [3.23e+02 6.23e-01 8.23e+02]
The Vector B : 
[[ 3.    63.     0.78 ]
[ 0.315 32.    42.   ]]
Product of two vectors :  [ 1650.189 34687.681]
tanh(AB) :  [1. 1.]
tanh(A) :  [1.         0.55321335 1.        ]
tanh(B) : 
[[0.99505475 1.         0.65270671]
[0.30497892 1.         1.        ]]

翻譯自: https://www.includehelp.com/python/printing-hyperbolic-tangent-value-of-vector-matrix-elements-using-numpy-tanh.aspx