Currently RQ, QL, and LQ factorizations are not included in Matlab, although these factorizations can also be done by QR function and additional matrix manipulations if matrix is square. Therefore I wrote these mex files, which uses the internal LAPACK routines of Matlab. QR1 is added to complete the set. They can also handle empty matrices. Enforcing positive elements on diagonal R matrix or column pivoting is supported by the QR1 factorization only.
Ivo Houtzager (2022). QR/RQ/QL/LQ factorizations (https://github.com/iwoodsawyer/factor/releases/tag/v18.104.22.168), GitHub. Retrieved .
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