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annotate liboctave/dbleQRP.cc @ 11518:141b3fb5cef7

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style fixes
author John W. Eaton <jwe@octave.org>
date Thu, 13 Jan 2011 16:52:30 -0500
parents 9ee5a0a1b93d
children fd0a3ac60b0e
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 2002, 2003, 2004, 2005, 2007,
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4 2008, 2009 John W. Eaton
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5 Copyright (C) 2009 VZLU Prague
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6
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7 This file is part of Octave.
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8
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9 Octave is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 3 of the License, or (at your
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12 option) any later version.
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13
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14 Octave is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with Octave; see the file COPYING. If not, see
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21 <http://www.gnu.org/licenses/>.
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23 */
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25 #ifdef HAVE_CONFIG_H
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26 #include <config.h>
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27 #endif
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28
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29 #include <cassert>
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31 #include "dbleQRP.h"
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32 #include "f77-fcn.h"
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33 #include "lo-error.h"
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34 #include "oct-locbuf.h"
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35
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36 extern "C"
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37 {
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38 F77_RET_T
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39 F77_FUNC (dgeqp3, DGEQP3) (const octave_idx_type&, const octave_idx_type&,
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40 double*, const octave_idx_type&,
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41 octave_idx_type*, double*, double*,
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42 const octave_idx_type&, octave_idx_type&);
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43 }
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44
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45 // It would be best to share some of this code with QR class...
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46
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47 QRP::QRP (const Matrix& a, qr_type_t qr_type)
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48 : QR (), p ()
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49 {
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50 init (a, qr_type);
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51 }
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52
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53 void
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54 QRP::init (const Matrix& a, qr_type_t qr_type)
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55 {
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56 assert (qr_type != qr_type_raw);
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57
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58 octave_idx_type m = a.rows ();
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59 octave_idx_type n = a.cols ();
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61 octave_idx_type min_mn = m < n ? m : n;
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62 OCTAVE_LOCAL_BUFFER (double, tau, min_mn);
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64 octave_idx_type info = 0;
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65
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66 Matrix afact = a;
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67 if (m > n && qr_type == qr_type_std)
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68 afact.resize (m, m);
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69
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70 MArray<octave_idx_type> jpvt (n, 1, 0);
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72 if (m > 0)
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73 {
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74 // workspace query.
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75 double rlwork;
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76 F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (),
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77 tau, &rlwork, -1, info));
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78
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79 // allocate buffer and do the job.
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80 octave_idx_type lwork = rlwork;
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81 lwork = std::max (lwork, static_cast<octave_idx_type> (1));
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82 OCTAVE_LOCAL_BUFFER (double, work, lwork);
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83 F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (),
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84 tau, work, lwork, info));
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85 }
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86 else
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87 for (octave_idx_type i = 0; i < n; i++) jpvt(i) = i+1;
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88
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89 // Form Permutation matrix (if economy is requested, return the
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90 // indices only!)
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91
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92 jpvt -= static_cast<octave_idx_type> (1);
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93 p = PermMatrix (jpvt, true);
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95
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96 form (n, afact, tau, qr_type);
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97 }
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98
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99 RowVector
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100 QRP::Pvec (void) const
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101 {
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102 Array<double> pa (p.pvec ());
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103 RowVector pv (MArray<double> (pa) + 1.0);
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104 return pv;
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105 }