compute eigen values of a matrix with symbolic variable
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%The code is :
syms A ;
matrix = [A, (2*A)-1; 4*A, 2*A];
A = 1.0;
matrix
subs(matrix, A,1)
A
% reset(symengine)
matrix
eig(matrix)
I want to compute the eigen values of a matrix filled with symbolic variable A. I used
1. reset(symengine) option
2. subs(matrix, A,1)
but i am getting the answer with symbolic variable only as follows:
(3*A)/2 - (33*A^2 - 16*A)^(1/2)/2
(3*A)/2 + (33*A^2 - 16*A)^(1/2)/2
But i want the answer(eigen values of matrix ) as
matrix=[1 1;4 2];
eig(matrix)
-0.5616
3.5616
Please help in this regard.
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Risposte (1)
Walter Roberson
il 12 Feb 2014
subs(matrix, A, 1) does not change matrix: it produces a new value with the substitution made.
eig(double(subs(matrix, A,1)))
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