How to obtain the eigenvalues when I get the warning that the matrix is singular?

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Jonas Morgner 2022-5-4

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回答： Walter Roberson 2022-5-4

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How can I obtain the row reduction method to get the values for Lamda?

% A
I = eye(2)
m1 = [7 3; 3 -1]
Lamda = 8                   % The value for λ
% B
LaI = I * Lamda            % Identity matrix - value of λ
m2s = m1 - LaI            % Caluculating the new matrix
% C
zc = zeros(size(m2s,1),1)     % creating a zero column
m3s = [m2s, zc]                     % adding the zero column at the end

I tried to use the forward an backward passing method, but there I only get the warning that the matrix is singular.

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回答（1 个）

Walter Roberson 2022-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/1711410-how-to-obtain-the-eigenvalues-when-i-get-the-warning-that-the-matrix-is-singular#answer_956785

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% A

I = eye(2)

I = 2×2

1 0 0 1

m1 = [7 3; 3 -1]

m1 = 2×2

7 3 3 -1

syms Lamda % The value for λ

% B

LaI = I * Lamda % Identity matrix - value of λ

LaI =

m2s = m1 - LaI % Caluculating the new matrix

m2s =

d = det(m2s)

d =

eigens = solve(d)

eigens =

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