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annotate liboctave/dbleQRP.cc @ 11542:695141f1c05c ss-3-3-55

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snapshot 3.3.55
author John W. Eaton <jwe@octave.org>
date Sat, 15 Jan 2011 04:53:04 -0500
parents fd0a3ac60b0e
children 57632dea2446
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1 /*
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2
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3 Copyright (C) 1994-2011 John W. Eaton
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4 Copyright (C) 2009 VZLU Prague
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <cassert>
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29
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30 #include "dbleQRP.h"
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31 #include "f77-fcn.h"
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32 #include "lo-error.h"
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33 #include "oct-locbuf.h"
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34
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35 extern "C"
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36 {
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37 F77_RET_T
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38 F77_FUNC (dgeqp3, DGEQP3) (const octave_idx_type&, const octave_idx_type&,
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39 double*, const octave_idx_type&,
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40 octave_idx_type*, double*, double*,
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41 const octave_idx_type&, octave_idx_type&);
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42 }
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43
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44 // It would be best to share some of this code with QR class...
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45
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46 QRP::QRP (const Matrix& a, qr_type_t qr_type)
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47 : QR (), p ()
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48 {
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49 init (a, qr_type);
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50 }
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51
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52 void
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53 QRP::init (const Matrix& a, qr_type_t qr_type)
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54 {
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55 assert (qr_type != qr_type_raw);
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56
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57 octave_idx_type m = a.rows ();
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58 octave_idx_type n = a.cols ();
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59
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60 octave_idx_type min_mn = m < n ? m : n;
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61 OCTAVE_LOCAL_BUFFER (double, tau, min_mn);
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62
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63 octave_idx_type info = 0;
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64
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65 Matrix afact = a;
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66 if (m > n && qr_type == qr_type_std)
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67 afact.resize (m, m);
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68
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69 MArray<octave_idx_type> jpvt (n, 1, 0);
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70
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71 if (m > 0)
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72 {
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73 // workspace query.
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74 double rlwork;
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75 F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (),
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76 tau, &rlwork, -1, info));
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77
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78 // allocate buffer and do the job.
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79 octave_idx_type lwork = rlwork;
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80 lwork = std::max (lwork, static_cast<octave_idx_type> (1));
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81 OCTAVE_LOCAL_BUFFER (double, work, lwork);
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82 F77_XFCN (dgeqp3, DGEQP3, (m, n, afact.fortran_vec (), m, jpvt.fortran_vec (),
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83 tau, work, lwork, info));
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84 }
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85 else
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86 for (octave_idx_type i = 0; i < n; i++) jpvt(i) = i+1;
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87
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88 // Form Permutation matrix (if economy is requested, return the
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89 // indices only!)
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90
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91 jpvt -= static_cast<octave_idx_type> (1);
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92 p = PermMatrix (jpvt, true);
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94
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95 form (n, afact, tau, qr_type);
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96 }
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97
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98 RowVector
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99 QRP::Pvec (void) const
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100 {
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101 Array<double> pa (p.pvec ());
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102 RowVector pv (MArray<double> (pa) + 1.0);
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103 return pv;
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104 }