mirror of
https://gitlab.com/libeigen/eigen.git
synced 2025-07-25 06:14:26 +08:00
3ee06ec52f
For certain inputs, the real schur decomposition might get stuck in a cycle. Exceptional shifts are supposed to knock us out of that - but previously they were only ever applied at iteration 10 and 30, which doesn't help if the cycle starts after cycle 30. Modified to apply a shift every 16 iterations (for reference, LAPACK seems to do it every 6 iterations). Also added an assert in polynomial solver to verify that the schur decomposition was successful. Fixes #2633.