Assigning variable names to eigenvalues
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In MATLab,
I am unsure how to take the output from an eigenvalue calculation to then use in another calculation.
For example I input
A = [1 2 3; 1 2 3; 1 2 3];
L = eig(A)
%This is where i need to assign variable names to the eigenvalues returned and order them from largest to smallest.
Thanks!
回答（1 个）
Just subscript the original vector to refer to them individually —
format long G
A = [1 2 3; 1 2 3; 1 2 3];
L = eig(A)
format short
L(1)
L(2)
L(3)
.
1 个评论
Walter Roberson
2021-9-7
You could proceed to
E1 = L(1);
E2 = L(2);
E3 = L(3);
but then when you went to order them, it would be far easier to use
sorted_eig = sort(L,'descend')
than it would be to use
if E1 >= E2
if E1 >= E3
sorted_eig = [E1, E2, E3];
else
sorted_eig = [E3, E1, E2];
end
else
... and more tests
end
Putting them into individual variables is Not Helpful for this purpose.
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