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

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?

Answer 1

[Cyrus Tirband]

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)

[Arooj Ibrahim]

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

Answer 2

[Arooj Ibrahim]

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..