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1 /* |
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2 |
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_SVD_h) |
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24 #define octave_SVD_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 class ostream; |
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31 |
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32 #include "dDiagMatrix.h" |
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33 #include "dMatrix.h" |
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34 |
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35 class |
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36 SVD |
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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 sigma_only |
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45 }; |
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46 |
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47 SVD (void) : sigma (), left_sm (), right_sm () { } |
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48 |
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49 SVD (const Matrix& a, type svd_type = SVD::std) { init (a, svd_type); } |
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50 |
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51 SVD (const Matrix& a, int& info, type svd_type = SVD::std) |
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52 { |
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53 info = init (a, svd_type); |
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54 } |
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55 |
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56 SVD (const SVD& a) |
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57 : sigma (a.sigma), left_sm (a.left_sm), right_sm (a.right_sm) { } |
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58 |
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59 SVD& operator = (const SVD& a) |
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60 { |
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61 if (this != &a) |
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62 { |
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63 sigma = a.sigma; |
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64 left_sm = a.left_sm; |
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65 right_sm = a.right_sm; |
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66 } |
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67 |
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68 return *this; |
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69 } |
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70 |
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71 ~SVD (void) { } |
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72 |
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73 DiagMatrix singular_values (void) const { return sigma; } |
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74 |
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75 Matrix left_singular_matrix (void) const; |
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76 |
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77 Matrix right_singular_matrix (void) const; |
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78 |
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79 friend ostream& operator << (ostream& os, const SVD& a); |
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80 |
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81 private: |
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82 |
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83 SVD::type type_computed; |
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84 |
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85 DiagMatrix sigma; |
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86 Matrix left_sm; |
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87 Matrix right_sm; |
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88 |
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89 int init (const Matrix& a, type svd_type = std); |
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90 }; |
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91 |
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92 #endif |
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93 |
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94 /* |
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95 ;;; Local Variables: *** |
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96 ;;; mode: C++ *** |
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97 ;;; End: *** |
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98 */ |
