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：

1. Machine Learning

   機器學習

2. Neural Network

   神經網絡

3. Geometry

   幾何

4. 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 operation
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)
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