Changing order when calculating frequencies in a loop

For a campbell analysis of a rotation system, I'm calculating the critical frequencies with gyroscopic effect in a for loop in the frequency span of 3000 rad/s. At the end of the loop, I'm saving the frequencies in a matrix to plot the campbell diagram afterwards. Here the problem occurs. For an example, if the backward whirl frequency for the second frequency becomes lower than the forward whirl frequency of the first frequency, they switch indicies in the matrix, and therefore, the campbell diagram becomes a mess.

Does any of you have any suggestions on how to fix this problem?

Example of plot. Notice that what should be a smooth curve change color (direction).

[Mathieu NOE]

hello

maybe you should post the code instead of an image of it

this way we can better help you

[Casper Drangsfeldt]

Didn't thought about that, sorry. The script is now attached. A bit long, since the campbell is only a part of the total script. But the image shows which lines

[Mathieu NOE]

It may not please you but the poor's man solution is to force all traces to have same color so you don't see that effect

%--------------------------------------------------------------------------
% Plotting
%--------------------------------------------------------------------------
w = 1:w;
figure(2)
% for i = 1:size(CAM,1)
%     plot(w,(CAM(i,:)),'LineWidth',2)
%     hold on
%     pause
% end
plot(w,CAM,'b','LineWidth',2)
hold on
plot(w,w,'r--','LineWidth',2)

[Casper Drangsfeldt]

I've thought about that solution. I can also live with the mess as it is now, since I know why that mess occurs. It could be nice to not have that mess though.

[Mathieu NOE]

maybe a solution :

Avoiding automatic sorting of eigenvalues - (mathworks.com)

How to keep track of order eigenvalue in eig or eigs? - (mathworks.com)

[Casper Drangsfeldt]

First, I thought that the eigenshuffle would help, but it's only correcting the irst intersection. After that intersection, the mess is still the same. Otherwise, nice try though.