Dear Jens,
>> 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. Sadly it gives me a segfault at eig.init(), except for tiny matrices, although I just followed the simple example based on a dense matrix. I'll try write a bug report for spectra later, if I can nail it down to a simple example. Best regards, Peter
