Acquiring the unsorted form of an eigenvalue matrix

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S. Hannan
S. Hannan 2024-11-8
评论： Torsten 2024-11-9
Hi all,
I want to calculate the eigenvalues of a matrix. Seemingly, Matlab generates the sorted form of the matrix. Is it possible to achieve its unsorted form?
Thanks,
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AlvinLAU
AlvinLAU 2024-11-8
编辑：AlvinLAU 2024-11-8
https://www.mathworks.com/help/matlab/ref/eig.html?s_tid=srchtitle_site_search_1_eig
"By default eig does not always return the eigenvalues and eigenvectors in sorted order. Use the sort function to put the eigenvalues in ascending order and reorder the corresponding eigenvectors."
A = magic(5);
D = eig(A,"matrix");
while return your unsorted D
Torsten
Torsten 2024-11-9
Seemingly, Matlab generates the sorted form of the matrix. Is it possible to achieve its unsorted form?
There is not only one special "unsorted" form for the matrix of eigenvalues. If you want to get an unsorted result from a sorted one, use "randperm".

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