Mercurial > hg > octave-nkf
view liboctave/dbleQRP.cc @ 10804:3d5c6b84ddaf
speed-up fixes to dlmread
author | Jaroslav Hajek <highegg@gmail.com> |
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date | Tue, 20 Jul 2010 12:50:54 +0200 |
parents | 4d1fc073fbb7 |
children | 9ee5a0a1b93d |
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/* Copyright (C) 1994, 1995, 1996, 1997, 2002, 2003, 2004, 2005, 2007, 2008, 2009 John W. Eaton Copyright (C) 2009 VZLU Prague This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <cassert> #include "dbleQRP.h" #include "f77-fcn.h" #include "lo-error.h" #include "oct-locbuf.h" extern "C" { F77_RET_T F77_FUNC (dgeqp3, DGEQP3) (const octave_idx_type&, const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type*, double*, double*, const octave_idx_type&, octave_idx_type&); } // It would be best to share some of this code with QR class... QRP::QRP (const Matrix& a, qr_type_t qr_type) : QR (), p () { init (a, qr_type); } void QRP::init (const Matrix& a, qr_type_t qr_type) { assert (qr_type != qr_type_raw); octave_idx_type m = a.rows (); octave_idx_type n = a.cols (); octave_idx_type min_mn = m < n ? m : n; OCTAVE_LOCAL_BUFFER (double, tau, min_mn); octave_idx_type info = 0; Matrix afact = a; if (m > n && qr_type == qr_type_std) afact.resize (m, m); MArray<octave_idx_type> jpvt (n, 1, 0); if (m > 0) { // workspace query. double rlwork; F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (), tau, &rlwork, -1, info)); // allocate buffer and do the job. octave_idx_type lwork = rlwork; lwork = std::max (lwork, static_cast<octave_idx_type> (1)); OCTAVE_LOCAL_BUFFER (double, work, lwork); F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (), tau, work, lwork, info)); } else for (octave_idx_type i = 0; i < n; i++) jpvt(i) = i+1; // Form Permutation matrix (if economy is requested, return the // indices only!) jpvt -= static_cast<octave_idx_type> (1); p = PermMatrix (jpvt, true); form (n, afact, tau, qr_type); } ColumnVector QRP::Pvec (void) const { Array<double> pa (p.pvec ()); ColumnVector pv (MArray<double> (pa) + 1.0); return pv; }