4280 |
27 Jan 23 |
peter |
1 |
#ifndef _theplu_yat_utility_cholesky_decomposer_ |
4280 |
27 Jan 23 |
peter |
2 |
#define _theplu_yat_utility_cholesky_decomposer_ |
4280 |
27 Jan 23 |
peter |
3 |
|
4280 |
27 Jan 23 |
peter |
// $Id$ |
4280 |
27 Jan 23 |
peter |
5 |
|
4280 |
27 Jan 23 |
peter |
6 |
/* |
4280 |
27 Jan 23 |
peter |
Copyright (C) 2023 Peter Johansson |
4280 |
27 Jan 23 |
peter |
8 |
|
4280 |
27 Jan 23 |
peter |
This file is part of the yat library, https://dev.thep.lu.se/yat |
4280 |
27 Jan 23 |
peter |
10 |
|
4280 |
27 Jan 23 |
peter |
The yat library is free software; you can redistribute it and/or |
4280 |
27 Jan 23 |
peter |
modify it under the terms of the GNU General Public License as |
4280 |
27 Jan 23 |
peter |
published by the Free Software Foundation; either version 3 of the |
4280 |
27 Jan 23 |
peter |
License, or (at your option) any later version. |
4280 |
27 Jan 23 |
peter |
15 |
|
4280 |
27 Jan 23 |
peter |
The yat library is distributed in the hope that it will be useful, |
4280 |
27 Jan 23 |
peter |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
4280 |
27 Jan 23 |
peter |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
4280 |
27 Jan 23 |
peter |
General Public License for more details. |
4280 |
27 Jan 23 |
peter |
20 |
|
4280 |
27 Jan 23 |
peter |
You should have received a copy of the GNU General Public License |
4280 |
27 Jan 23 |
peter |
along with yat. If not, see <https://www.gnu.org/licenses/>. |
4280 |
27 Jan 23 |
peter |
23 |
*/ |
4280 |
27 Jan 23 |
peter |
24 |
|
4280 |
27 Jan 23 |
peter |
25 |
#include <yat/utility/Matrix.h> |
4280 |
27 Jan 23 |
peter |
26 |
|
4280 |
27 Jan 23 |
peter |
27 |
namespace theplu { |
4280 |
27 Jan 23 |
peter |
28 |
namespace yat { |
4280 |
27 Jan 23 |
peter |
29 |
namespace utility { |
4280 |
27 Jan 23 |
peter |
30 |
|
4280 |
27 Jan 23 |
peter |
31 |
class VectorBase; |
4280 |
27 Jan 23 |
peter |
32 |
class VectorMutable; |
4280 |
27 Jan 23 |
peter |
33 |
|
4280 |
27 Jan 23 |
peter |
34 |
/** |
4280 |
27 Jan 23 |
peter |
\brief Wrapper class around |
4280 |
27 Jan 23 |
peter |
<a href "https://www.gnu.org/software/gsl/doc/html/linalg.html#cholesky-decomposition">GSL Cholesky Decomposition</a> |
4280 |
27 Jan 23 |
peter |
37 |
|
4280 |
27 Jan 23 |
peter |
From the input matrix \c A, the class calculates \c L such that |
4280 |
27 Jan 23 |
peter |
\f$ A = L * L^T\f$, \c L is a lower triangular matrix. |
4280 |
27 Jan 23 |
peter |
40 |
|
4280 |
27 Jan 23 |
peter |
\since New in yat 0.21 |
4280 |
27 Jan 23 |
peter |
42 |
*/ |
4280 |
27 Jan 23 |
peter |
43 |
class CholeskyDecomposer |
4280 |
27 Jan 23 |
peter |
44 |
{ |
4280 |
27 Jan 23 |
peter |
45 |
public: |
4280 |
27 Jan 23 |
peter |
46 |
/** |
4280 |
27 Jan 23 |
peter |
Input matrix A must be square and positive definite. A is assumed |
4280 |
27 Jan 23 |
peter |
to be symmetric and elements above diagnonal are ignored. |
4280 |
27 Jan 23 |
peter |
49 |
*/ |
4280 |
27 Jan 23 |
peter |
50 |
CholeskyDecomposer(const MatrixBase& A); |
4280 |
27 Jan 23 |
peter |
51 |
|
4280 |
27 Jan 23 |
peter |
52 |
/** |
4280 |
27 Jan 23 |
peter |
Input matrix A must be square and positive definite. A is assumed |
4280 |
27 Jan 23 |
peter |
to be symmetric and elements above diagnonal are ignored. |
4280 |
27 Jan 23 |
peter |
55 |
*/ |
4280 |
27 Jan 23 |
peter |
56 |
CholeskyDecomposer(Matrix&& A); |
4280 |
27 Jan 23 |
peter |
57 |
|
4280 |
27 Jan 23 |
peter |
58 |
/** |
4280 |
27 Jan 23 |
peter |
Calculate the inverse matrix of \c A and return it in passed |
4280 |
27 Jan 23 |
peter |
matrix \c X |
4280 |
27 Jan 23 |
peter |
61 |
*/ |
4280 |
27 Jan 23 |
peter |
62 |
void invert(Matrix& X) const; |
4280 |
27 Jan 23 |
peter |
63 |
|
4280 |
27 Jan 23 |
peter |
64 |
/** |
4280 |
27 Jan 23 |
peter |
\return a reference to matrix \c L |
4280 |
27 Jan 23 |
peter |
66 |
*/ |
4280 |
27 Jan 23 |
peter |
67 |
const Matrix& L(void) const; |
4280 |
27 Jan 23 |
peter |
68 |
|
4280 |
27 Jan 23 |
peter |
69 |
/** |
4280 |
27 Jan 23 |
peter |
Solve the equation system Ax = b for given A and b. Solution is |
4280 |
27 Jan 23 |
peter |
returned in \c x. |
4280 |
27 Jan 23 |
peter |
72 |
*/ |
4280 |
27 Jan 23 |
peter |
73 |
void solve(const VectorBase& b, VectorMutable& x) const; |
4280 |
27 Jan 23 |
peter |
74 |
private: |
4280 |
27 Jan 23 |
peter |
75 |
void decompose(Matrix&&); |
4280 |
27 Jan 23 |
peter |
76 |
Matrix L_; |
4280 |
27 Jan 23 |
peter |
77 |
}; |
4280 |
27 Jan 23 |
peter |
78 |
|
4280 |
27 Jan 23 |
peter |
79 |
}}} // of namespace utility, yat, and theplu |
4280 |
27 Jan 23 |
peter |
80 |
|
4280 |
27 Jan 23 |
peter |
81 |
#endif |