linbox  1
Butterfly< _Field, Switch > Class Template Reference

Switching Network based BlackBox Matrix. A good preconditioner. More...

#include <butterfly.h>

Inheritance diagram for Butterfly< _Field, Switch >:
BlackboxInterface

List of all members.

Butterfly

Butterfly preconditioner and supporting function

 Butterfly (const Field &F, size_t n, typename Switch::Factory &factory)
template<class OutVector , class InVector >
OutVector & apply (OutVector &y, const InVector &x) const
template<class OutVector , class InVector >
OutVector & applyTranspose (OutVector &y, const InVector &x) const

Detailed Description

template<class _Field, class Switch>
class LinBox::Butterfly< _Field, Switch >

Switching Network based BlackBox Matrix. A good preconditioner.

Implements butterfly switching network on a LinBox vector as a black box matrix through the use of a switch object.

This is a blackbox matrix object, and it implements all purely virtual methods of the abstract base class. See BlackboxArchetype} for the specification of these methods.

This matrix requires a dense vector to be used. Sparse vectors must somehow be converted to dense vectors before this matrix may be applied to them.

Parameters:
VectorLinBox dense vector type
Switchswitch object type

Constructor & Destructor Documentation

Butterfly ( const Field &  F,
size_t  n,
typename Switch::Factory &  factory 
) [inline]

Constructor from an integer and a switch object. The switch object is an object that is applied to two references to elements to switch them. It must have both an apply and an applyTranspose method. It must contain all information needed by the switch other than the elements themselves. This includes any random numbers or sequences of values. It must also be able to be applied as many times as needed. In particular, it must be able to create new random elements or repeat a stored sequence of values. This is not required by the abstract base class.

Parameters:
ninteger size of vectors to be applied to
Sswitch predicate object object

The documentation for this class was generated from the following file: