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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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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 2, or (at your option) any |
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11 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, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_SVD_h) |
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25 #define octave_SVD_h 1 |
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26 |
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27 class ostream; |
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28 |
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29 #include "dDiagMatrix.h" |
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30 #include "dMatrix.h" |
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31 |
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32 extern "C++" { |
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33 |
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34 class SVD |
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35 { |
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36 friend class Matrix; |
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37 |
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38 public: |
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39 |
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40 enum type |
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41 { |
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42 std, |
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43 economy, |
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44 }; |
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45 |
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46 SVD (void) {} |
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47 |
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48 SVD (const Matrix& a, SVD::type svd_type = SVD::std); |
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49 SVD (const Matrix& a, int& info, SVD::type svd_type = SVD::std); |
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50 |
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51 SVD (const SVD& a); |
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52 |
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53 SVD& operator = (const SVD& a); |
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54 |
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55 DiagMatrix singular_values (void) const; |
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56 Matrix left_singular_matrix (void) const; |
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57 Matrix right_singular_matrix (void) const; |
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58 |
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59 friend ostream& operator << (ostream& os, const SVD& a); |
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60 |
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61 private: |
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62 |
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63 int init (const Matrix& a, SVD::type svd_type = SVD::std); |
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64 |
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65 DiagMatrix sigma; |
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66 Matrix left_sm; |
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67 Matrix right_sm; |
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68 }; |
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69 |
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70 inline SVD::SVD (const Matrix& a, SVD::type svd_type) |
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71 { |
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72 init (a, svd_type); |
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73 } |
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74 |
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75 inline SVD::SVD (const Matrix& a, int& info, SVD::type svd_type) |
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76 { |
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77 info = init (a, svd_type); |
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78 } |
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79 |
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80 inline SVD::SVD (const SVD& a) |
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81 { |
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82 sigma = a.sigma; |
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83 left_sm = a.left_sm; |
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84 right_sm = a.right_sm; |
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85 } |
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86 |
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87 inline SVD& |
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88 SVD::operator = (const SVD& a) |
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89 { |
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90 sigma = a.sigma; |
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91 left_sm = a.left_sm; |
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92 right_sm = a.right_sm; |
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93 |
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94 return *this; |
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95 } |
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96 |
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97 inline DiagMatrix SVD::singular_values (void) const |
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98 { |
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99 return sigma; |
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100 } |
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101 |
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102 inline Matrix SVD::left_singular_matrix (void) const |
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103 { |
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104 return left_sm; |
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105 } |
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106 |
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107 inline Matrix SVD::right_singular_matrix (void) const |
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108 { |
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109 return right_sm; |
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110 } |
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111 |
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112 } // extern "C++" |
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113 |
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114 #endif |
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115 |
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116 /* |
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117 ;;; Local Variables: *** |
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118 ;;; mode: C++ *** |
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119 ;;; page-delimiter: "^/\\*" *** |
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120 ;;; End: *** |
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121 */ |
