Thyra_describeLinearOp.hpp

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//    Thyra: Interfaces and Support for Abstract Numerical Algorithms
//                 Copyright (2004) Sandia Corporation
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// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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#ifndef THYRA_DESCRIBE_LINEAR_OP_HPP
#define THYRA_DESCRIBE_LINEAR_OP_HPP

#include "Thyra_describeLinearOpDecl.hpp"
#include "Thyra_LinearOpBase.hpp"
#include "Thyra_MultiVectorBase.hpp"
#include "Thyra_VectorStdOps.hpp"
#include "Thyra_AssertOp.hpp"
#include "Thyra_AssertOp.hpp"

template<class RangeScalar, class DomainScalar>
void Thyra::describeLinearOp(
  const LinearOpBase<RangeScalar,DomainScalar>   &A
  ,Teuchos::FancyOStream                         &out_arg
  ,const Teuchos::EVerbosityLevel                verbLevel
  )
{
  using Teuchos::RCP;
  using Teuchos::FancyOStream;
  using Teuchos::OSTab;
  typedef Teuchos::ScalarTraits<DomainScalar> DST;
  RCP<FancyOStream> out = rcp(&out_arg,false);
  OSTab tab(out);
  *out << A.description() << "\n";
  const Teuchos::RCP<const VectorSpaceBase<RangeScalar> >
    range = A.range();
  const Teuchos::RCP<const VectorSpaceBase<DomainScalar> >
    domain = A.domain();
  if(!range.get()) {
    return;
  }
  const Index dimDomain = domain->dim(), dimRange = range->dim();
  if ( dimDomain > 0 && dimRange > 0 && verbLevel >= Teuchos::VERB_EXTREME ) {
    // Copy into dense matrix by column
    Teuchos::RCP<VectorBase<DomainScalar> > e_j = createMember(domain);
    Teuchos::RCP<VectorBase<RangeScalar> >  t   = createMember(range); // temp column
    RTOpPack::ConstSubVectorView<RangeScalar> sv;
    std::vector<RangeScalar>  Md( dimRange * dimDomain ); // Column major
    const Index
      cs = 1,         // stride for columns or rows 
      rs = dimRange;  // stride for rows or columns
    Index i, j;
    OSTab tab2(out);
    for( j = 0; j < dimDomain; ++j ) {
      Thyra::assign( e_j.get(), DST::zero() );
      Thyra::set_ele( j, DST::one(), e_j.get() );
      apply(A,NONCONJ_ELE,*e_j,t.get());  // extract the ith column or row
      t->acquireDetachedView(Range1D(),&sv);
      for( i = 0; i < dimRange; ++i ) Md[ i*cs + j*rs ] = sv(i);
      t->releaseDetachedView(&sv);
    }
    // Print the matrix
    for( i = 0; i < dimRange; ++i ) {
      for( j = 0; j < dimDomain; ++j )
        *out << " " << i << ":" << j << ":" << Md[ i + j*dimRange ];
      *out << std::endl;
    }
  }
}

#endif // THYRA_DESCRIBE_LINEAR_OP_HPP

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