Replying to [dead] sibling post from kxyvr: yes, Accelerate provides a Q-less sparse QR on Apple platforms (https://developer.apple.com/documentation/accelerate

Replying to [dead] sibling post from kxyvr: yes, Accelerate provides a Q-less sparse QR on Apple platforms (https://developer.apple.com/documentation/accelerate/sparse_solvers https://developer.apple.com/documentation/accelerate/sparse_..., in particular SparseFactorizationCholeskyAtA). I believe that MA49 from HSL does it as well, and may have more acceptable licensing than SuiteSparse depending on your situation.