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Teko_DiagonalPreconditionerOp.cpp
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00006 //      Teko: A package for block and physics based preconditioning
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00045 */
00046 
00047 #include "Teko_DiagonalPreconditionerOp.hpp"
00048 #include "Thyra_EpetraThyraWrappers.hpp"
00049 #include "EpetraExt_PointToBlockDiagPermute.h"
00050 #include "Epetra_MultiVector.h"
00051 
00052 using Teuchos::rcpFromRef;
00053 using Teuchos::rcp_dynamic_cast;
00054 using Teuchos::rcp_const_cast;
00055 using Teuchos::RCP;
00056 
00057 using Thyra::MultiVectorBase;
00058 
00059 namespace Teko {
00060 
00061 DiagonalPreconditionerOp::DiagonalPreconditionerOp(Teuchos::RCP<EpetraExt_PointToBlockDiagPermute> BDP, const VectorSpace range, const VectorSpace domain):
00062   BDP_(BDP),
00063   range_(range),
00064   domain_(domain)
00065 {}
00066 
00067 void DiagonalPreconditionerOp::implicitApply(const MultiVector & x, MultiVector & y,
00068                 const double alpha, const double beta) const
00069 {
00070   // Get the Multivectors into Epetra land
00071   // NTS: Thyra inexplicably wants maps, even when they are completely unecessary.
00072   const Epetra_Map & rangemap_=BDP_->OperatorRangeMap();
00073   const Epetra_Map & domainmap_=BDP_->OperatorDomainMap();
00074 
00075   RCP<const Epetra_MultiVector> x_=Thyra::get_Epetra_MultiVector(domainmap_,x);
00076   RCP<Epetra_MultiVector> y_=Thyra::get_Epetra_MultiVector(rangemap_,y); 
00077   TEUCHOS_ASSERT(x_!=Teuchos::null);
00078   TEUCHOS_ASSERT(y_!=Teuchos::null);
00079 
00080 
00081   // y = \alpha M x + \beta y $
00082   if(beta==0.0){
00083     BDP_->ApplyInverse(*x_,*y_);
00084     scale(alpha,y);
00085   }
00086   else{
00087     MultiVector y0=deepcopy(y);
00088     BDP_->ApplyInverse(*x_,*y_);
00089     update(alpha,y,beta,y0);  
00090   }
00091 }
00092 
00093 void DiagonalPreconditionerOp::describe(Teuchos::FancyOStream & out_arg,
00094                                       const Teuchos::EVerbosityLevel verbLevel) const
00095 {
00096   using Teuchos::OSTab;
00097 
00098   switch(verbLevel) {
00099      case Teuchos::VERB_DEFAULT:
00100      case Teuchos::VERB_LOW:
00101         out_arg << this->description() << std::endl;
00102         break;
00103      case Teuchos::VERB_MEDIUM:
00104      case Teuchos::VERB_HIGH:
00105      case Teuchos::VERB_EXTREME:
00106        if(BDP_!=Teuchos::null)
00107    BDP_->Print(out_arg);
00108        break;
00109      default:
00110         TEST_FOR_EXCEPT(true); // Should never get here!
00111   }
00112 }
00113 
00114 } // end namespace Teko
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