How can I create a function which outputs two variables for calculating the eigenvalue * eigenvector

Question

Jonas Morgner 2022-5-9

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评论： Dyuman Joshi 2023-10-10

m1 = [7 3; 3 -1] % Matrix
[Vectors, DiagonalWithValues] = eig(m1) 
ListEvalues = diag(DiagonalWithValues) 

How can I implement a function which takes these 3 inputs (1. initial matrix, 2. eigenvectors, 3.eigenvalues) and returns two variables

1. a boolean variable, which indicates if both are equal

2. result of the operation for example if they are not equal it should return -1

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Dyuman Joshi 2022-5-9

Use isequal() for the 1st output

Use if else for the 2nd output. But what is the value of 2nd output if they are equal?

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Answer 1

Nithin 2023-10-10

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编辑：Nithin 2023-10-10

在 MATLAB Online 中打开

Hi Jonas,

I understand that you want to create a function which outputs two variables on calculating the product of eigen value and eigen vector and then write a condition to generate the function output based on the match or mismatch of the variables.

To implement this function, kindly refer to the following code snippet -

M1 = [7 3; 3 -1]  %given matrix 
[eigenvectors, eigenvalues] = eig(M1); 
function [isEqual, result] = checkEigenMatch(M1, eigenvalues, eigenvectors) 
% Calculate the product of M1 * eigenvectors 
 product = M1 * eigenvectors; 
 % Calculate the product of eigenvalues * eigenvectors 
 productEigen = eigenvalues * eigenvectors; 
 % Check if the two products are equal within a small tolerance 
 tolerance = 1e-6; 
 isEqual = isequal(product, productEigen, tolerance); 
 % Set result based on the comparison 
 if isEqual 
     
        result = true; 
 else 
     
        result = -1; 
 end 
end 

To know more information regarding the calculation of eigen vectors and eigen values, kindly refer to the following documentation:

https://in.mathworks.com/help/matlab/ref/eig.html

I hope this answer resolves your query.

Regards,

Nithin Kumar.

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Dyuman Joshi 2023-10-10

@Nithin, Please don't do obvious homework questions on MATLAB Answers, when no effort has been shown. This does not help the student, who learns nothing more than to post all of their homwork problems on the site, hoping they will find someone willing to do their thinking and work for them. Worse that that, it convinces the next student who comes along to do the same.

If you want to help, then find a way to push the student in the right direction. But posting a complete solution does far more harm than good.

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