GNU Octave  3.8.0
A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
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floatAEPBAL.cc
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1 /*
2 
3 Copyright (C) 1994-2013 John W. Eaton
4 Copyright (C) 2008 Jaroslav Hajek
5 
6 This file is part of Octave.
7 
8 Octave is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
12 
13 Octave is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17 
18 You should have received a copy of the GNU General Public License
19 along with Octave; see the file COPYING. If not, see
20 <http://www.gnu.org/licenses/>.
21 
22 */
23 
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27 
28 #include <string>
29 
30 #include "floatAEPBAL.h"
31 #include "f77-fcn.h"
32 
33 extern "C"
34 {
35  F77_RET_T
36  F77_FUNC (sgebal, SGEBAL) (F77_CONST_CHAR_ARG_DECL,
37  const octave_idx_type&, float*,
38  const octave_idx_type&, octave_idx_type&,
39  octave_idx_type&, float*, octave_idx_type&
41 
42  F77_RET_T
43  F77_FUNC (sgebak, SGEBAK) (F77_CONST_CHAR_ARG_DECL,
45  const octave_idx_type&, const octave_idx_type&,
46  const octave_idx_type&, const float*,
47  const octave_idx_type&, float*,
48  const octave_idx_type&, octave_idx_type&
51 }
52 
54  bool noperm, bool noscal)
56 {
57  octave_idx_type n = a.cols ();
58 
59  if (a.rows () != n)
60  {
61  (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix");
62  return;
63  }
64 
65  octave_idx_type info;
66 
68  float *pscale = scale.fortran_vec ();
69 
70  balanced_mat = a;
71  float *p_balanced_mat = balanced_mat.fortran_vec ();
72 
73  job = noperm ? (noscal ? 'N' : 'S') : (noscal ? 'P' : 'B');
74 
75  F77_XFCN (sgebal, SGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
76  n, p_balanced_mat, n, ilo, ihi, pscale, info
77  F77_CHAR_ARG_LEN (1)));
78 }
79 
82 {
84  FloatMatrix balancing_mat (n, n, 0.0);
85  for (octave_idx_type i = 0; i < n; i++)
86  balancing_mat.elem (i ,i) = 1.0;
87 
88  float *p_balancing_mat = balancing_mat.fortran_vec ();
89  const float *pscale = scale.fortran_vec ();
90 
91  octave_idx_type info;
92 
93  char side = 'R';
94 
95  F77_XFCN (sgebak, SGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
96  F77_CONST_CHAR_ARG2 (&side, 1),
97  n, ilo, ihi, pscale, n,
98  p_balancing_mat, n, info
100  F77_CHAR_ARG_LEN (1)));
101 
102  return balancing_mat;
103 }