Hi,

Suppose that we are tring to solve a genralized eigenvalue problem, how can we solve it in ITensor by using lapack functions?

The Hamiltonain now is a 2n rank tensor, and the eigenvector is now a n rank tensor. Should we tranform the tensors into matrix or vector and invoke standard lapack functions?

What about other linear equations? There should be a generalized method to use lapack functions to solve these equations.

Thanks