/usr/include/rheolef/eye.h is in librheolef-dev 5.93-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | # ifndef _SKIT_EYE_H
# define _SKIT_EYE_H
///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef 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 of the License, or
/// (at your option) any later version.
///
/// Rheolef 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 Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
///
/// =========================================================================
/*Class:eye
NAME: @code{eye} - identity matrix
DESCRIPTION:
Following matlab, the name EYE is used in place of I to denote identity matrices
because I is often used as a subscript or as sqrt(-1). The dimensions of EYE are
determined by context. For example,
@example
b = a + 3*EYE
@end example
adds 3 to the diagonal elements of A.
Small caps 'eye' is the class name, and upper case 'EYE' is the const variable
"eye<double>()", i.e. the identity matrix.
The preconditioner interface is usefull when calling algorithms without any
preconditioners, e.g.
@example
int status = cg (a, x, b, EYE, 100, 1e-7);
@end example
AUTHOR: Pierre.Saramito@imag.fr
DATE: 28 january 1997
End:
*/
// ================ [ class implementation ] ====================================
//<eye:
# include "rheolef/skitbase.h"
namespace rheolef {
template<class T>
class eye {
public:
eye (const T& mu = 1);
eye operator * (const T& mu) const { return eye(lambda*mu); }
friend eye operator * (const T& mu, const eye<T>& E) { return eye(mu*E.lambda); }
vec<T> operator * (const vec<T>& x) const;
vec<T> solve (const vec<T>& x) const;
vec<T> trans_solve (const vec<T>& x) const { return solve(x); }
private:
T lambda;
};
#define EYE eye<Float>()
//>eye:
// Remark: the shared libraries are sometime buggy
// and cannot initialize class constructor. So, do not define
// extern const eye<Float> EYE;
template<class T>
inline
eye<T>::eye(const T& mu)
: lambda(mu)
{
}
template<class T>
inline
vec<T>
eye<T>::solve(const vec<T>& x) const
{
if (lambda == T(1)) return x; else return Float(1./lambda)*x;
}
template<class T>
inline
vec<T>
eye<T>::operator * (const vec<T>& x) const
{
if (lambda == 1) return x;
return lambda*x;
}
}// namespace rheolef
# endif // _SKIT_EYE_H
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