what command should i use to have real part of the eigenvalues of the matrix in symbolic form

Question

Arooj Ibrahim 2019-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/488001-what-command-should-i-use-to-have-real-part-of-the-eigenvalues-of-the-matrix-in-symbolic-form

回答： Arooj Ibrahim 2019-10-29

采纳的回答： Cyrus Tirband

clear all

m=sym('m')

n=sym('n')

A=[0 1 1/sqrt(3*n*m); 2 4 2/sqrt(3*n*m); 3 4 5/sqrt(3*n*m)]

eig(A)

I need to find the eigenvalues of this matrix but i just want a precise answer of variables 'n' and 'm' in real form, its not working, what should i do?

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Answer 1

Cyrus Tirband 2019-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/488001-what-command-should-i-use-to-have-real-part-of-the-eigenvalues-of-the-matrix-in-symbolic-form#answer_398688

在 MATLAB Online 中打开

Use the sym command when defining the matrix

m=sym('m')
n=sym('n')
 A=sym([0 1 1/sqrt(3*n*m); 2 4 2/sqrt(3*n*m); 3 4 5/sqrt(3*n*m)])
eig(A)

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Arooj Ibrahim 2019-10-29

this gives the same answer.. i need a way to hav precise answer

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Answer 2

Arooj Ibrahim 2019-10-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488001-what-command-should-i-use-to-have-real-part-of-the-eigenvalues-of-the-matrix-in-symbolic-form#answer_398695

clear all

m=sym('m')

n=sym('n')

A=sym([0 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m) 1/sqrt(3*n*m); 1/sqrt(3*n*m) 0 1/3 0 1/3 0 0 0 0; 1/sqrt(3*n*m) 1/3 0 1/3 0 0 0 0; 1/sqrt(3*n*m) 0 1/3 0 1/3 0 0 0 0; 1/sqrt(3*n*m) 1/3 0 1/3 0 0 0 0 0; 1/sqrt(3*n*m) 0 0 0 0 0 1/3 0 1/3; 1/sqrt(3*n*m) 0 0 0 0 1/3 0 1/3 0; 1/sqrt(3*n*m) 0 0 0 0 0 1/3 0 1/3; 1/sqrt(3*n*m) 0 0 0 0 1/3 0 1/3 0] )

eig(A)

I need to find the eigenvalues of this matrix in symbolic form but the code is not working, help me out..