Re: [eigen] Bug(s) report: SparseQR on tall-thin matrices

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Take a look at which includes some fixes related to those you’ve already pointed to, and a revamp of LevenbergMarquardt using much faster specialist QRs:

Looking at your tmp2 in the SparseQR_QProduct, if you swap the j and k loops you can save the time of repeatedly making the tmp2 here for multi-column results. However, I haven't run into needing a tmp on GCC, clang or MSVC14. Which compiler are you using?


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