How can I get only the real eigenvalues of a complex eigenvalue problem?

4 次查看（过去 30 天）

James 2014-12-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/164936-how-can-i-get-only-the-real-eigenvalues-of-a-complex-eigenvalue-problem

I have a large complex eigenvalue problem, and I am using eigs(A,B,k,sigma) to solve the problem. A and B are both large, sparse complex matrices. For instance, if k=400, sigma='sm', then I get about 100 real eigenvalues, 150 imaginary eigenvalues, and 150 complex eigenvalues. This is very computationally expensive, however, I am only interested in the real eigenvalues. Is there any way to calculate only the real eigenvalues please?