L_18u

Standard documentation for qr_solve:

 Solve using a sparse QR factorization.

::

 qr_solve(DM b, DM v, DM r, DM beta, [int] prinv, [int] pc, bool tr) -> DM
 qr_solve(SX b, SX v, SX r, SX beta, [int] prinv, [int] pc, bool tr) -> SX

Extra doc: https://github.com/casadi/casadi/wiki/L_18u

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/matrix_decl.hpp#L549

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/matrix_decl.hpp#L549-L554

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