/usr/include/trilinos/Ifpack2_Utilities.hpp is in libtrilinos-ifpack2-dev 12.12.1-5.
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// ***********************************************************************
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// Ifpack2: Tempated Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK2_UTILITIES_HPP
#define IFPACK2_UTILITIES_HPP
#include "Ifpack2_ConfigDefs.hpp"
#include "Teuchos_RefCountPtr.hpp"
#include "Teuchos_ScalarTraits.hpp"
#include "Tpetra_ConfigDefs.hpp"
#include "Tpetra_CrsGraph.hpp"
//! @file Ifpack2_Utilities.hpp
//! @brief File for utility functions.
namespace Ifpack2 {
namespace Details {
/*! @brief Compute and return the graph of the diagonal of the input graph.
This is copied from Tpetra::Experimental::BlockCrsMatrix.
*/
template <class graph_type>
Teuchos::RCP<Tpetra::CrsGraph<typename graph_type::local_ordinal_type, typename graph_type::global_ordinal_type, typename graph_type::node_type> >
computeDiagonalGraph (graph_type const &graph)
{
typedef typename graph_type::local_ordinal_type LO;
typedef typename graph_type::global_ordinal_type GO;
typedef typename graph_type::node_type NO;
typedef Tpetra::Map<LO, GO, NO> map_type;
typedef Tpetra::CrsGraph<LO, GO, NO> crs_graph_type;
const size_t maxDiagEntPerRow = 1;
// NOTE (mfh 12 Aug 2014) We could also pass in the column Map
// here. However, we still would have to do LID->GID lookups to
// make sure that we are using the correct diagonal column
// indices, so it probably wouldn't help much.
Teuchos::RCP<graph_type> diagonalGraph;
diagonalGraph = Teuchos::rcp(new crs_graph_type(graph.getRowMap(), maxDiagEntPerRow, Tpetra::StaticProfile));
const map_type& meshRowMap = *(graph.getRowMap());
Teuchos::Array<GO> diagGblColInds(maxDiagEntPerRow);
for (LO lclRowInd = meshRowMap.getMinLocalIndex(); lclRowInd <= meshRowMap.getMaxLocalIndex(); ++lclRowInd) {
const GO gblRowInd = meshRowMap.getGlobalElement(lclRowInd);
diagGblColInds[0] = gblRowInd;
diagonalGraph->insertGlobalIndices(gblRowInd, diagGblColInds());
}
diagonalGraph->fillComplete(graph.getDomainMap(), graph.getRangeMap());
return diagonalGraph;
}
}// namespace Details
}// namespace Ifpack2
#endif //IFPACK2_UTILITIES_HPP
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