Dear Jens, thanks for the reference.
Am 20.01.21 um 20:19 schrieb Jens Wehner: > Hey Peter, > > if your system is reasonably large iterative methods could be what you are > looking for > > Libraries like https://github.com/yixuan/spectra > <https://github.com/yixuan/spectra> implement such things on top of Eigen. Actually I'm setting up a small test for a Lanczos diagonalization. In that specific application the diagonalization is for an auxiliary problem to find a good approximation for the initial state, and that system is not sparse. Nevertheless I should benchmark it, Btw, that's a test project as I'm thinking whether I should switch my main project < https://projects.tuxfamily.org/?do=group;name=prg > to eigen. Currently I'm still using boost.ublas which my own interface to BLAS/LaPack. Best regards, Peter
