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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 #if defined (__GNUG__) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 class ostream; |
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32 |
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33 #include "dDiagMatrix.h" |
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34 #include "dMatrix.h" |
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35 |
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36 class |
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37 SVD |
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38 { |
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39 public: |
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40 |
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41 enum type |
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42 { |
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43 std, |
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44 economy, |
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45 sigma_only, |
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46 }; |
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47 |
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48 SVD (void) : sigma (), left_sm (), right_sm () { } |
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49 |
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50 SVD (const Matrix& a, type svd_type = SVD::std) { init (a, svd_type); } |
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51 |
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52 SVD (const Matrix& a, int& info, type svd_type = SVD::std) |
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53 { |
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54 info = init (a, svd_type); |
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55 } |
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56 |
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57 SVD (const SVD& a) |
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58 : sigma (a.sigma), left_sm (a.left_sm), right_sm (a.right_sm) { } |
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59 |
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60 SVD& operator = (const SVD& a) |
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61 { |
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62 if (this != &a) |
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63 { |
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64 sigma = a.sigma; |
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65 left_sm = a.left_sm; |
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66 right_sm = a.right_sm; |
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67 } |
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68 |
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69 return *this; |
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70 } |
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71 |
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72 DiagMatrix singular_values (void) const { return sigma; } |
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73 |
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74 Matrix left_singular_matrix (void) const; |
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75 |
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76 Matrix right_singular_matrix (void) const; |
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77 |
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78 friend ostream& operator << (ostream& os, const SVD& a); |
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79 |
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80 private: |
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81 |
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82 SVD::type type_computed; |
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83 |
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84 DiagMatrix sigma; |
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85 Matrix left_sm; |
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86 Matrix right_sm; |
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87 |
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88 int init (const Matrix& a, type svd_type = std); |
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89 }; |
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90 |
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91 #endif |
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92 |
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93 /* |
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94 ;;; Local Variables: *** |
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95 ;;; mode: C++ *** |
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96 ;;; page-delimiter: "^/\\*" *** |
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97 ;;; End: *** |
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98 */ |
