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optimize accumdim with summation
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 05 Mar 2010 12:31:30 +0100
parents 07ebe522dac2
children 141b3fb5cef7
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 2000, 2002, 2003, 2004, 2005,
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4 2007 John W. Eaton
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5 Copyright (C) 2008 Jaroslav Hajek
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6
3d4b4f0fa5ba [project @ 1994-06-06 00:33:33 by jwe]
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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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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 <string>
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30
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31 #include "dbleAEPBAL.h"
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32 #include "f77-fcn.h"
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33
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34 extern "C"
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35 {
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36 F77_RET_T
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37 F77_FUNC (dgebal, DGEBAL) (F77_CONST_CHAR_ARG_DECL,
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38 const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&,
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39 octave_idx_type&, double*, octave_idx_type&
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40 F77_CHAR_ARG_LEN_DECL);
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41
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42 F77_RET_T
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43 F77_FUNC (dgebak, DGEBAK) (F77_CONST_CHAR_ARG_DECL,
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44 F77_CONST_CHAR_ARG_DECL,
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45 const octave_idx_type&, const octave_idx_type&, const octave_idx_type&,
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46 const double*, const octave_idx_type&, double*,
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47 const octave_idx_type&, octave_idx_type&
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48 F77_CHAR_ARG_LEN_DECL
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49 F77_CHAR_ARG_LEN_DECL);
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50 }
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51
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52 AEPBALANCE::AEPBALANCE (const Matrix& a, bool noperm, bool noscal)
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53 : base_aepbal<Matrix, ColumnVector> ()
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54 {
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55 octave_idx_type n = a.cols ();
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56
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57 if (a.rows () != n)
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58 {
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59 (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix");
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60 return;
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61 }
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63 octave_idx_type info;
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64
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65 scale = ColumnVector (n);
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66 double *pscale = scale.fortran_vec ();
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67
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68 balanced_mat = a;
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69 double *p_balanced_mat = balanced_mat.fortran_vec ();
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70
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71 job = noperm ? (noscal ? 'N' : 'S') : (noscal ? 'P' : 'B');
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72
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73 F77_XFCN (dgebal, DGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
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74 n, p_balanced_mat, n, ilo, ihi, pscale, info
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75 F77_CHAR_ARG_LEN (1)));
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76 }
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77
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78 Matrix
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79 AEPBALANCE::balancing_matrix (void) const
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80 {
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81 octave_idx_type n = balanced_mat.rows ();
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82 Matrix balancing_mat (n, n, 0.0);
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83 for (octave_idx_type i = 0; i < n; i++)
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84 balancing_mat.elem (i ,i) = 1.0;
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85
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86 double *p_balancing_mat = balancing_mat.fortran_vec ();
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87 const double *pscale = scale.fortran_vec ();
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88
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89 octave_idx_type info;
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90
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91 char side = 'R';
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92
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93 F77_XFCN (dgebak, DGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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94 F77_CONST_CHAR_ARG2 (&side, 1),
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95 n, ilo, ihi, pscale, n,
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96 p_balancing_mat, n, info
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97 F77_CHAR_ARG_LEN (1)
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98 F77_CHAR_ARG_LEN (1)));
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99
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100 return balancing_mat;
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101 }