Variables in matrix not updating from for loop
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Nolan Ames
el 22 de Jun. de 2021
Comentada: Nolan Ames
el 22 de Jun. de 2021
I am currently using a for loop in order to find the maximum eigenvalues of a matrix. The loop is as follows
for k = 0:c
e = eig(z)
M = max(e)
x = [x,M]
k = k+1
end
The variable k begins at 0, and the loop runs until c, a count of 50. z is the following 4x4 matrix: [k 0 2 0; 0 k 0 2; 3 4 5 0; 4 3 0 5]. What I am attempting to do is extract the maximum eigenvalue from the matrix, add it to an array x , then add 1 to k within the matrix, and continue until c is reached. However, k within the matrix is not updating, so it is simply finding the same eigenvalue 50 times. The k working the counter is performing as expected, but what do I have to do in order to make the k within the matrix update at each step as well?
2 comentarios
Scott MacKenzie
el 22 de Jun. de 2021
Editada: Scott MacKenzie
el 22 de Jun. de 2021
It would help if you provided all the code so it can be excuted to produce the error.
But, note that this line
k = k+1;
has no bearing on "k within the matrix".
Furthermore, k is the loop index variable in your for-loop, so it cannot be changed within the loop. So, there are a few issues to resolve.
Respuesta aceptada
Scott MacKenzie
el 22 de Jun. de 2021
Editada: Scott MacKenzie
el 22 de Jun. de 2021
I think this is what you are looking for. It updates k in the z matrix in each iteration of the loop. The max values accumulate in the vector x.
c = 50;
k = 0;
z = [k 0 2 0; 0 k 0 2; 3 4 5 0; 4 3 0 5];
x = [];
for k = 0:c
e = eig(z);
M = max(e);
x = [x,M];
% update k in z
z(1,1)=k;
z(2,2)=k;
end
x % output max values
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