1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software: you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by
13 the Free Software Foundation, either version 3 of the License, or
14 (at your option) any later version.
16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
28 Singular value decomposition of a rectangular matrix.
34 \*---------------------------------------------------------------------------*/
39 #include "scalarMatrices.H"
41 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
46 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
49 /*---------------------------------------------------------------------------*\
51 \*---------------------------------------------------------------------------*/
57 //- Rectangular matrix with the same dimensions as the input
58 scalarRectangularMatrix U_;
61 scalarRectangularMatrix V_;
63 //- The singular values
64 DiagonalMatrix<scalar> S_;
66 //- The matrix product V S^(-1) U^T
67 scalarRectangularMatrix VSinvUt_;
69 //- The number of zero singular values
73 // Private Member Functions
75 //- Disallow default bitwise copy construct
78 //- Disallow default bitwise assignment
79 void operator=(const SVD&);
82 inline const T sign(const T& a, const T& b);
89 //- Construct from a rectangular Matrix
90 SVD(const scalarRectangularMatrix& A, const scalar minCondition = 0);
96 inline const scalarRectangularMatrix& U() const;
98 //- Return the square matrix V
99 inline const scalarRectangularMatrix& V() const;
101 //- Return the singular values
102 inline const scalarDiagonalMatrix& S() const;
104 //- Return VSinvUt (the pseudo inverse)
105 inline const scalarRectangularMatrix& VSinvUt() const;
107 //- Return the number of zero singular values
108 inline label nZeros() const;
110 //- Return the minimum non-zero singular value
111 inline scalar minNonZeroS() const;
115 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
117 } // End namespace Foam
119 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
123 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
127 // ************************************************************************* //