How to solve eigen-problem in itensor?

Question

Hi,
I'm working on a project with itensor and needing to solve eigenvalues and vectors of a matrix-like ITensor, e.g., H=ITensor(i,i'), and the bound i.m() <=100 is not large.

Could someone help me out.
Thanks in advance.

Comments

Hi, is the matrix Hermitian or a general matrix?

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Hi miles,
Sorry for a late response, Hermitian solver is enough in my recent project.

update: gmail filters  ITensor Support Q&A mail as spam, and I've missed the notification.

Answer 1

Hi, so if you tensor is equivalent to a Hermitian matrix, you can use the diagHermitian function described on this page of the documentation:

http://itensor.org/docs.cgi?page=classes/decomp

Please let me know if that does not give you what you need -

Best regards,
Miles

Comments

Thanks, diagHermitian do works.

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Hello Miles,

If the tensor is not Hermitian, how can one get the eigenvalues?

Best regards,
João