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Teko_StridedEpetraOperator.cpp
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00006 //      Teko: A package for block and physics based preconditioning
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00045 */
00046 
00047 #include "Epetra/Teko_StridedEpetraOperator.hpp"
00048 #include "Epetra/Teko_StridedMappingStrategy.hpp"
00049 #include "Epetra/Teko_ReorderedMappingStrategy.hpp"
00050 
00051 #include "Teuchos_VerboseObject.hpp"
00052 
00053 #include "Thyra_LinearOpBase.hpp"
00054 #include "Thyra_EpetraLinearOp.hpp"
00055 #include "Thyra_EpetraThyraWrappers.hpp"
00056 #include "Thyra_DefaultProductMultiVector.hpp"
00057 #include "Thyra_DefaultProductVectorSpace.hpp"
00058 #include "Thyra_DefaultBlockedLinearOp.hpp"
00059 #include "Thyra_get_Epetra_Operator.hpp"
00060 
00061 #include "Epetra_Vector.h"
00062 #include "EpetraExt_MultiVectorOut.h"
00063 #include "EpetraExt_RowMatrixOut.h"
00064 
00065 #include "Teko_Utilities.hpp"
00066 
00067 namespace Teko {
00068 namespace Epetra {
00069 
00070 using Teuchos::RCP;
00071 using Teuchos::rcp;
00072 using Teuchos::rcp_dynamic_cast;
00073 
00074 StridedEpetraOperator::StridedEpetraOperator(int numVars,const Teuchos::RCP<const Epetra_Operator> & content,
00075                                              const std::string & label) 
00076       : Teko::Epetra::EpetraOperatorWrapper(), label_(label)
00077 {
00078    std::vector<int> vars;
00079    
00080    // build vector describing the sub maps
00081    for(int i=0;i<numVars;i++) vars.push_back(1);
00082 
00083    SetContent(vars,content);
00084 }
00085 
00086 StridedEpetraOperator::StridedEpetraOperator(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Operator> & content,
00087                                              const std::string & label) 
00088       : Teko::Epetra::EpetraOperatorWrapper(), label_(label)
00089 {
00090    SetContent(vars,content);
00091 }
00092 
00093 void StridedEpetraOperator::SetContent(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Operator> & content)
00094 { 
00095    fullContent_ = content;
00096    stridedMapping_ = rcp(new StridedMappingStrategy(vars,Teuchos::rcpFromRef(fullContent_->OperatorDomainMap()),
00097                                                          fullContent_->Comm()));
00098    SetMapStrategy(stridedMapping_);
00099 
00100    // build thyra operator
00101    BuildBlockedOperator(); 
00102 }
00103 
00104 void StridedEpetraOperator::BuildBlockedOperator()
00105 {
00106    TEUCHOS_ASSERT(stridedMapping_!=Teuchos::null);
00107 
00108    // get a CRS matrix
00109    const RCP<const Epetra_CrsMatrix> crsContent = rcp_dynamic_cast<const Epetra_CrsMatrix>(fullContent_);
00110 
00111    // ask the strategy to build the Thyra operator for you
00112    if(stridedOperator_==Teuchos::null) {
00113       stridedOperator_ = stridedMapping_->buildBlockedThyraOp(crsContent,label_);
00114    }
00115    else {
00116       const RCP<Thyra::BlockedLinearOpBase<double> > blkOp = rcp_dynamic_cast<Thyra::BlockedLinearOpBase<double> >(stridedOperator_,true);
00117       stridedMapping_->rebuildBlockedThyraOp(crsContent,blkOp);
00118    }
00119 
00120    // set whatever is returned
00121    SetOperator(stridedOperator_,false);
00122 
00123    // reorder if neccessary
00124    if(reorderManager_!=Teuchos::null) 
00125       Reorder(*reorderManager_);
00126 }
00127 
00128 const Teuchos::RCP<const Epetra_Operator> StridedEpetraOperator::GetBlock(int i,int j) const
00129 {
00130    const RCP<const Thyra::BlockedLinearOpBase<double> > blkOp 
00131          = Teuchos::rcp_dynamic_cast<const Thyra::BlockedLinearOpBase<double> >(getThyraOp());
00132 
00133    return Thyra::get_Epetra_Operator(*blkOp->getBlock(i,j));
00134 }
00135 
00139 void StridedEpetraOperator::Reorder(const BlockReorderManager & brm)
00140 {
00141    reorderManager_ = rcp(new BlockReorderManager(brm));
00142 
00143    // build reordered objects
00144    RCP<const MappingStrategy> reorderMapping = rcp(new ReorderedMappingStrategy(*reorderManager_,stridedMapping_));
00145    RCP<const Thyra::BlockedLinearOpBase<double> > blockOp
00146          = rcp_dynamic_cast<const Thyra::BlockedLinearOpBase<double> >(stridedOperator_);
00147 
00148    RCP<const Thyra::LinearOpBase<double> > A = buildReorderedLinearOp(*reorderManager_,blockOp);
00149 
00150    // set them as working values
00151    SetMapStrategy(reorderMapping);
00152    SetOperator(A,false);
00153 }
00154 
00156 void StridedEpetraOperator::RemoveReording()
00157 {
00158    SetMapStrategy(stridedMapping_);
00159    SetOperator(stridedOperator_,false);
00160    reorderManager_ = Teuchos::null;
00161 }
00162 
00165 void StridedEpetraOperator::WriteBlocks(const std::string & prefix) const
00166 {
00167    RCP<Thyra::PhysicallyBlockedLinearOpBase<double> > blockOp
00168          = rcp_dynamic_cast<Thyra::PhysicallyBlockedLinearOpBase<double> >(stridedOperator_);
00169 
00170    // get size of strided block operator
00171    int rows = Teko::blockRowCount(blockOp);
00172 
00173    for(int i=0;i<rows;i++) {
00174       for(int j=0;j<rows;j++) {
00175          // build the file name
00176          std::stringstream ss;
00177          ss << prefix << "_" << i << j << ".mm";
00178 
00179          // get the row matrix object (Note: can't use "GetBlock" method b/c matrix might be reordered)
00180          RCP<const Epetra_RowMatrix> mat
00181                = Teuchos::rcp_dynamic_cast<const Epetra_RowMatrix>(Thyra::get_Epetra_Operator(*blockOp->getBlock(i,j)));
00182 
00183          // write to file
00184          EpetraExt::RowMatrixToMatrixMarketFile(ss.str().c_str(),*mat);
00185       }
00186    }
00187 }
00188 
00196 std::string StridedEpetraOperator::PrintNorm(const eNormType & nrmType,const char newline)
00197 {
00198    BlockedLinearOp blockOp = toBlockedLinearOp(stridedOperator_);
00199 
00200    // get size of strided block operator
00201    int rowCount = Teko::blockRowCount(blockOp);
00202    int colCount = Teko::blockRowCount(blockOp);
00203 
00204    std::stringstream ss;
00205    ss.precision(4);
00206    ss << std::scientific;
00207    for(int row=0;row<rowCount;row++) {
00208       for(int col=0;col<colCount;col++) {
00209          // get the row matrix object (Note: can't use "GetBlock" method b/c matrix might be reordered)
00210          RCP<const Epetra_CrsMatrix> mat = Teuchos::rcp_dynamic_cast<const Epetra_CrsMatrix>(
00211                Thyra::get_Epetra_Operator(*blockOp->getBlock(row,col)));
00212 
00213          // compute the norm
00214          double norm = 0.0;
00215          switch(nrmType) {
00216          case Inf: 
00217             norm = mat->NormInf();
00218             break;
00219          case One: 
00220             norm = mat->NormOne();
00221             break;
00222          case Frobenius: 
00223             norm = mat->NormFrobenius();
00224             break;
00225          default:
00226             TEUCHOS_TEST_FOR_EXCEPTION(true,std::runtime_error,
00227                                "StridedEpetraOperator::eNormType incorrectly specified");
00228          }
00229 
00230          ss << norm << " "; 
00231       }
00232       ss << newline;
00233    }
00234 
00235    return ss.str();
00236 }
00237 
00238 #ifndef Teko_DEBUG_OFF
00239 bool StridedEpetraOperator::testAgainstFullOperator(int count,double tol) const
00240 {
00241    Epetra_Vector xf(OperatorRangeMap());
00242    Epetra_Vector xs(OperatorRangeMap());
00243    Epetra_Vector y(OperatorDomainMap());
00244 
00245    // test operator many times
00246    bool result = true;
00247    double diffNorm=0.0,trueNorm=0.0;
00248    for(int i=0;i<count;i++) {
00249       xf.PutScalar(0.0);
00250       xs.PutScalar(0.0);
00251       y.Random();
00252 
00253       // apply operator
00254       Apply(y,xs); // xs = A*y
00255       fullContent_->Apply(y,xf); // xf = A*y
00256 
00257       // compute norms
00258       xs.Update(-1.0,xf,1.0);
00259       xs.Norm2(&diffNorm);
00260       xf.Norm2(&trueNorm);
00261 
00262       // check result
00263       result &= (diffNorm/trueNorm < tol);
00264    }
00265 
00266    return result;
00267 }
00268 #endif
00269 
00270 } // end namespace Epetra
00271 } // end namespace Teko
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