ungr2 - Robuta Search

https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-c/2025-2/p-orgr2-p-ungr2.html p?orgr2/p?ungr2 Generates all or part of the orthogonal/unitary matrix Q from an RQ factorization determined by p?gerqf (unblocked algorithm). p