QR Node5 gemqr:          multiply by Q from geqr Node17 gemqrt:         multiply by Q from geqrt Node4 geqr:           QR factor, flexible Node8 geqr2:          QR factor, level 2 Node20 geqr2p:         QR factor, diag( R ) ≥ 0, level 2 Node3 — flexible — Node6 — classic — Node13 — with T — Node18 — positive — Node1 QR Node1->Node5 Node1->Node17 Node1->Node4 Node1->Node8 Node1->Node20 Node1->Node3 Node1->Node6 Node1->Node13 Node1->Node18 Node7 geqrf:          QR factor Node1->Node7 Node19 geqrfp:         QR factor, diag( R ) ≥ 0 Node1->Node19 Node14 geqrt:          QR factor, with T Node1->Node14 Node15 geqrt2:         QR factor, with T, level 2 Node1->Node15 Node16 geqrt3:         QR factor, with T, recursive panel Node1->Node16 Node10 {un,or}g2r:     generate explicit Q from geqrf, level 2 Node1->Node10 Node9 {un,or}gqr:     generate explicit Q from geqrf Node1->Node9 Node12 {un,or}m2r:     multiply by Q from geqrf, level 2 Node1->Node12 Node11 {un,or}mqr:     multiply by Q from geqrf Node1->Node11 Node2 Orthogonal/unitary factors (QR, CS, etc.) Node2->Node1 .