I know ?geqrf to calculate m-by-n A = QR and then ungqr to generate Q. but the Q is m-by-m square matrix, what i want is Q m-by-n.
I really don't know how to deal with this, I found p?geqrf and p?ungqr would generate Q with m-by-n, but I think it's a parallel ?geqrf, it might not help me. could anyone help me, please? thanks very much..