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- // -*- C++ -*-
- /*
-
- Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton
-
- This file is part of Octave.
-
- Octave is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- Octave is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License
- along with Octave; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- */
-
- #if !defined (octave_SVD_h)
- #define octave_SVD_h 1
-
- class ostream;
-
- #include "dDiagMatrix.h"
- #include "dMatrix.h"
-
- extern "C++" {
-
- class SVD
- {
- friend class Matrix;
-
- public:
-
- enum type
- {
- std,
- economy,
- };
-
- SVD (void) {}
-
- SVD (const Matrix& a, SVD::type svd_type = SVD::std);
- SVD (const Matrix& a, int& info, SVD::type svd_type = SVD::std);
-
- SVD (const SVD& a);
-
- SVD& operator = (const SVD& a);
-
- DiagMatrix singular_values (void) const;
- Matrix left_singular_matrix (void) const;
- Matrix right_singular_matrix (void) const;
-
- friend ostream& operator << (ostream& os, const SVD& a);
-
- private:
-
- int init (const Matrix& a, SVD::type svd_type = SVD::std);
-
- DiagMatrix sigma;
- Matrix left_sm;
- Matrix right_sm;
- };
-
- inline SVD::SVD (const Matrix& a, SVD::type svd_type)
- {
- init (a, svd_type);
- }
-
- inline SVD::SVD (const Matrix& a, int& info, SVD::type svd_type)
- {
- info = init (a, svd_type);
- }
-
- inline SVD::SVD (const SVD& a)
- {
- sigma = a.sigma;
- left_sm = a.left_sm;
- right_sm = a.right_sm;
- }
-
- inline SVD&
- SVD::operator = (const SVD& a)
- {
- sigma = a.sigma;
- left_sm = a.left_sm;
- right_sm = a.right_sm;
-
- return *this;
- }
-
- inline DiagMatrix SVD::singular_values (void) const
- {
- return sigma;
- }
-
- inline Matrix SVD::left_singular_matrix (void) const
- {
- return left_sm;
- }
-
- inline Matrix SVD::right_singular_matrix (void) const
- {
- return right_sm;
- }
-
- } // extern "C++"
-
- #endif
-
- /*
- ;;; Local Variables: ***
- ;;; mode: C++ ***
- ;;; page-delimiter: "^/\\*" ***
- ;;; End: ***
- */
-