/usr/include/linbox/algorithms/blackbox-container-symmetrize.h is in liblinbox-dev 1.1.6~rc0-4.1.
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/* linbox/algorithms/blackbox-container-symmetrize.h
* Copyright (C) 1999, 2001 Jean-Guillaume Dumas
*
* Written by Jean-Guillaume Dumas <Jean-Guillaume.Dumas@imag.fr>,
*
* ------------------------------------
* Bradford Hovinen <hovinen@cis.udel.edu>
*
* Ported to linbox-new framework; replaced use of DOTPROD, etc. with
* VectorDomain
* ------------------------------------
*
* See COPYING for license information.
*/
#ifndef __BLACKBOX_CONTAINER_SYMMETRIZE_H
#define __BLACKBOX_CONTAINER_SYMMETRIZE_H
#include <linbox/algorithms/blackbox-container-base.h>
namespace LinBox
{
/** \brief Symmetrizing iterator (for rank computations).
#
//================================================================
// LinBox Project 1999
// Symmetrizing iterator (for rank computations)
// Same left and right vector
// A is supposed to have tranpose-vector product
// the sequence is this->u^t this->u, (A this->u)^t (A this->u) = this->u^t (A^t A) this->u,
// (A^t (A this->u))^t (A^t (A this->u)) = this->u^t (A^t A)^2 this->u , etc.
// Time-stamp: <13 Jun 02 18:16:43 Jean-Guillaume.Dumas@imag.fr>
// ================================================================
#
*/
template<class Field, class _Blackbox, class RandIter = typename Field::RandIter>
class BlackboxContainerSymmetrize : public BlackboxContainerBase<Field, _Blackbox> {
public:
typedef _Blackbox Blackbox;
BlackboxContainerSymmetrize () {}
template<class Vector>
BlackboxContainerSymmetrize (const Blackbox *D, const Field &F, const Vector &u0)
: BlackboxContainerBase<Field, Blackbox> (D, F) { init (u0); }
//BlackboxContainerSymmetrize (const Blackbox *D, const Field &F, RandIter &g = typename Field::RandIter(_F) )
BlackboxContainerSymmetrize (const Blackbox *D, const Field &F, RandIter &g = typename Field::RandIter() )
: BlackboxContainerBase<Field, Blackbox> (D, F) { init (g); }
private:
void _launch () {
if (this->casenumber) {
this->casenumber = 0;
this->_BB->apply (this->v, this->u);
this->_VD.dot (this->_value, this->v, this->v);
} else {
this->casenumber = 1;
this->_BB->applyTranspose (this->u, this->v);
this->_VD.dot (this->_value, this->u, this->u);
}
}
void _wait () {}
};
};
#endif // __BLACKBOX_CONTAINER_SYMMETRIZE_H
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