I have two predetermined matrices A,B of size 4 x 4. I have a function whose independent variable is some complex number z and produces the eigenvalues of (A-z*B). Upon plotting however, strange blotches show up which I suspect are areas of discontinuity. However, the function is not discontinuous. Therefore, I think MATLAB may be mixing up the eigenvalues somehow. I don't know how the eigenvalues are organized but is there a way to ensure that the eigenvalues are grouped correctly?
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