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

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Arooj Ibrahim
Arooj Ibrahim 2019-10-29
回答： Arooj Ibrahim 2019-10-29
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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采纳的回答

Cyrus Tirband
Cyrus Tirband 2019-10-29
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)

更多回答（1 个）

Arooj Ibrahim
Arooj Ibrahim 2019-10-29
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..

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