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annotate liboctave/numeric/aepbalance.h @ 31249:de6fc38c78c6

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Make Jacobian types offered by dlsode.f accessible by lsode (bug #31626). * liboctave/numeric/LSODE-opts.in: Add options "jacobian type", "lower jacobian subdiagonals", and "upper jacobian subdiagonals". * liboctave/numeric/LSODE.cc (file scope, lsode_j, LSODE::do_integrate (double)): Handle new configurable Jacobian types. * build-aux/mk-opts.pl: Don't implicitly convert to integer in condition.
author Olaf Till <olaf.till@uni-jena.de>
date Fri, 12 Nov 2010 08:53:05 +0100
parents 796f54d4ddbf
children e88a07dec498
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 1994-2022 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if ! defined (octave_aepbalance_h)
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27 #define octave_aepbalance_h 1
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28
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29 #include "octave-config.h"
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30
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31 #include <algorithm>
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32
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33 namespace octave
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34 {
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35 namespace math
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36 {
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37 template <typename MT>
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38 class
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39 aepbalance
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40 {
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41 public:
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42
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43 typedef typename MT::real_column_vector_type VT;
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44
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45 aepbalance (void) : m_balanced_mat (), m_scale (), m_ilo (), m_ihi (), m_job () { }
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46
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47 OCTAVE_API aepbalance (const MT& a, bool noperm = false, bool noscal = false);
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48
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49 aepbalance (const aepbalance& a)
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50 : m_balanced_mat (a.m_balanced_mat), m_scale (a.m_scale),
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51 m_ilo(a.m_ilo), m_ihi(a.m_ihi), m_job(a.m_job)
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52 { }
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53
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54 aepbalance& operator = (const aepbalance& a)
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55 {
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56 if (this != &a)
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57 {
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58 m_balanced_mat = a.m_balanced_mat;
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59 m_scale = a.m_scale;
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60 m_ilo = a.m_ilo;
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61 m_ihi = a.m_ihi;
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62 m_job = a.m_job;
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63 }
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64
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65 return *this;
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66 }
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67
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68 virtual ~aepbalance (void) = default;
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69
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70 OCTAVE_API MT balancing_matrix (void) const;
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71
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72 MT balanced_matrix (void) const
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73 {
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74 return m_balanced_mat;
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75 }
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76
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77 VT permuting_vector (void) const
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78 {
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79 octave_idx_type n = m_balanced_mat.rows ();
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80
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81 VT pv (n);
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82
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83 for (octave_idx_type i = 0; i < n; i++)
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84 pv(i) = i+1;
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85
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86 for (octave_idx_type i = n-1; i >= m_ihi; i--)
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87 {
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88 octave_idx_type j = m_scale(i) - 1;
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89 std::swap (pv(i), pv(j));
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90 }
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91
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92 for (octave_idx_type i = 0; i < m_ilo-1; i++)
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93 {
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94 octave_idx_type j = m_scale(i) - 1;
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95 std::swap (pv(i), pv(j));
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96 }
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97
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98 return pv;
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99 }
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100
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101 VT scaling_vector (void) const
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102 {
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103 octave_idx_type n = m_balanced_mat.rows ();
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104
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105 VT scv (n);
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106
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107 for (octave_idx_type i = 0; i < m_ilo-1; i++)
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108 scv(i) = 1;
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109
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110 for (octave_idx_type i = m_ilo-1; i < m_ihi; i++)
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111 scv(i) = m_scale(i);
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112
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113 for (octave_idx_type i = m_ihi; i < n; i++)
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114 scv(i) = 1;
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115
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116 return scv;
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117 }
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118
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119 protected:
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120
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121 MT m_balanced_mat;
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122 VT m_scale;
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123 octave_idx_type m_ilo;
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124 octave_idx_type m_ihi;
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125 char m_job;
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126 };
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127 }
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128 }
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129
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130 #endif