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[Lapack] eigenvalue problem


I found that  eig and qz  matlab functions give infinite spurious modes, I 
think  the elimination of the spurious modes is needed when the matrix B  is 

Could you help me about this issue and provide me a matlab package or lapack 
routine which can solve the eigenvalue problem A X= c B X when A and B are 
complex and one of the matrices is singular ?

I really appreciate your help.

Best regards


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