向量余弦值python

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.cos(x) is a function used for generating a matrix/vector/variable with the cosine value of b x (as cos(x)). This is an element wise operation where each element in numpy.cos(x) corresponds to the Cosine of that element in x.

Numpy是一個功能庫，可幫助構造或操縱矩陣和向量。 函數numpy.cos(x)是用于生成余弦值為bx的矩陣/向量/變量(作為cos(x) )的函數 。 這是一個元素明智的操作，其中numpy.cos(x)中的每個元素對應于x中該元素的余弦。

Syntax:

句法：

numpy.cos(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 cos(x) values (between -1 and 1) at each entry.

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

Applications:

應用范圍：

Machine Learning

機器學習

Neural Network

神經網絡

Geometry

幾何

Physics Problems

物理問題

Python代碼打印向量/矩陣元素的余弦值 (Python code to print cosine value of vector/matrix elements)

# Linear Algebra Learning Sequence # Element Wise Cosine operationimport 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)print("\ncos(A) : ", np.cos(V)) print("\ncos(B) : \n", np.cos(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. ]]cos(A) : [-0.83423998 0.81213169 0.99527249]cos(B) : [[-0.9899925 0.98589658 0.71091354][ 0.95079638 0.83422336 -0.39998531]]

翻譯自: https://www.includehelp.com/python/printing-cosine-value-of-vector-matrix-element-wise-operation.aspx

向量余弦值python

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