Thyra_describeLinearOp.hpp

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00004 //    Thyra: Interfaces and Support for Abstract Numerical Algorithms
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00028 
00029 #ifndef THYRA_DESCRIBE_LINEAR_OP_HPP
00030 #define THYRA_DESCRIBE_LINEAR_OP_HPP
00031 
00032 #include "Thyra_describeLinearOpDecl.hpp"
00033 #include "Thyra_LinearOpBase.hpp"
00034 #include "Thyra_MultiVectorBase.hpp"
00035 #include "Thyra_VectorStdOps.hpp"
00036 #include "Thyra_AssertOp.hpp"
00037 #include "Thyra_AssertOp.hpp"
00038 
00039 template<class RangeScalar, class DomainScalar>
00040 void Thyra::describeLinearOp(
00041   const LinearOpBase<RangeScalar,DomainScalar>   &A
00042   ,Teuchos::FancyOStream                         &out_arg
00043   ,const Teuchos::EVerbosityLevel                verbLevel
00044   )
00045 {
00046   using Teuchos::RCP;
00047   using Teuchos::FancyOStream;
00048   using Teuchos::OSTab;
00049   typedef Teuchos::ScalarTraits<DomainScalar> DST;
00050   RCP<FancyOStream> out = rcp(&out_arg,false);
00051   OSTab tab(out);
00052   *out << A.description() << "\n";
00053   const Teuchos::RCP<const VectorSpaceBase<RangeScalar> >
00054     range = A.range();
00055   const Teuchos::RCP<const VectorSpaceBase<DomainScalar> >
00056     domain = A.domain();
00057   if(!range.get()) {
00058     return;
00059   }
00060   const Index dimDomain = domain->dim(), dimRange = range->dim();
00061   if(verbLevel >= Teuchos::VERB_EXTREME) {
00062     // Copy into dense matrix by column
00063     Teuchos::RCP<VectorBase<DomainScalar> > e_j = createMember(domain);
00064     Teuchos::RCP<VectorBase<RangeScalar> >  t   = createMember(range); // temp column
00065     RTOpPack::ConstSubVectorView<RangeScalar> sv;
00066     std::vector<RangeScalar>  Md( dimRange * dimDomain ); // Column major
00067     const Index
00068       cs = 1,         // stride for columns or rows 
00069       rs = dimRange;  // stride for rows or columns
00070     Index i, j;
00071     OSTab tab(out);
00072     for( j = 0; j < dimDomain; ++j ) {
00073       Thyra::assign( e_j.get(), DST::zero() );
00074       Thyra::set_ele( j, DST::one(), e_j.get() );
00075       apply(A,NONCONJ_ELE,*e_j,t.get());  // extract the ith column or row
00076       t->acquireDetachedView(Range1D(),&sv);
00077       for( i = 0; i < dimRange; ++i ) Md[ i*cs + j*rs ] = sv(i);
00078       t->releaseDetachedView(&sv);
00079     }
00080     // Print the matrix
00081     for( i = 0; i < dimRange; ++i ) {
00082       for( j = 0; j < dimDomain; ++j )
00083         *out << " " << i << ":" << j << ":" << Md[ i + j*dimRange ];
00084       *out << std::endl;
00085     }
00086   }
00087 }
00088 
00089 #endif // THYRA_DESCRIBE_LINEAR_OP_HPP

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