/usr/include/trilinos/Teko_IdentityPreconditionerFactory.hpp is in libtrilinos-teko-dev 12.12.1-5.
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// Teko: A package for block and physics based preconditioning
// Copyright 2010 Sandia Corporation
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#ifndef __Teko_IdentityPreconditionerFactory_hpp__
#define __Teko_IdentityPreconditionerFactory_hpp__
#include "Teuchos_RCP.hpp"
#include "Teko_BlockPreconditionerFactory.hpp"
#include "Teko_BlockInvDiagonalStrategy.hpp"
namespace Teko {
/** Uses a scaled identity operator as the approximate inverse.
* This is a last resort!
*
\code
<Parameter name="Type" type="string" value="Identity"/>
<Parameter name="Scaling" type="double" value="<Some value>"/>
\endcode
*/
class IdentityPreconditionerFactory : public PreconditionerFactory {
public:
//! @name Constructors.
//@{
/** Build an empty Identity preconditioner factory.
*/
IdentityPreconditionerFactory();
//@}
/** \brief Create the Identity preconditioner operator.
*
* This method breaks apart the BlockLinearOp and builds a block
* diagonal preconditioner. The inverse of the diagonals are specified
* by the BlockInvDiagonalStrategy object.
*/
LinearOp buildPreconditionerOperator(LinearOp & lo,PreconditionerState & state) const;
protected:
//! some members
double scaling_;
//! Initialize from a parameter list
virtual void initializeFromParameterList(const Teuchos::ParameterList & pl);
};
} // end namespace Teko
#endif
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