On Wed, Sep 21, 2016 at 8:24 PM, Mark Adams <mfad...@lbl.gov> wrote: > I thought least squares was for tall skinny (overdetermined) solves? I > have a short fat (5 x ~100) matrix to solve. >
Stefano is right. It will give you the minimum norm solution, which is the x consistent with the equations and with the minimum norm. Matt > On Wed, Sep 21, 2016 at 4:24 PM, Stefano Zampini < > stefano.zamp...@gmail.com> wrote: > >> Mark, >> >> You can use KSPLSQR >> >> Stefano >> >> Il 21 set 2016 11:21 PM, "Mark Adams" <mfad...@lbl.gov> ha scritto: >> >>> I want to solve for w in V' w = b, where V is tall and skinny. So a >>> short fat matrix "solve". This is underdetermined. I would like to minimize >>> the two norm (or any norm) of w. This looks like an optimization problem, >>> would TAO do this? >>> Mark >>> >> > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener
