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version is now 3.3.52
author John W. Eaton <jwe@octave.org>
date Sun, 01 Aug 2010 11:49:45 -0400
parents 4d1fc073fbb7
children 9ee5a0a1b93d
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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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22
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23 */
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24
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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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30
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31 #include "floatQRP.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 (sgeqp3, SGEQP3) (const octave_idx_type&, const octave_idx_type&, float*,
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40 const octave_idx_type&, octave_idx_type*, float*, float*,
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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 FloatQRP::FloatQRP (const FloatMatrix& a, qr_type_t qr_type)
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47 : FloatQR (), 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 FloatQRP::init (const FloatMatrix& 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 (float, 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 FloatMatrix 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 float rlwork;
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75 F77_XFCN (sgeqp3, SGEQP3, (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 (float, work, lwork);
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82 F77_XFCN (sgeqp3, SGEQP3, (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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93
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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 FloatColumnVector
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99 FloatQRP::Pvec (void) const
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100 {
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101 Array<float> pa (p.pvec ());
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102 FloatColumnVector pv (MArray<float> (pa) + 1.0f);
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103 return pv;
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104 }