/usr/include/trilinos/Zoltan2_AlgSpectral.hpp is in libtrilinos-zoltan2-dev 12.10.1-3.
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//
// ***********************************************************************
//
// Zoltan2: A package of combinatorial algorithms for scientific computing
// Copyright 2012 Sandia Corporation
//
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// @HEADER
#ifndef _ZOLTAN2_ALGSPECTRAL_HPP_
#define _ZOLTAN2_ALGSPECTRAL_HPP_
#include <Zoltan2_Algorithm.hpp>
#include <Zoltan2_GraphModel.hpp>
#include <Zoltan2_OrderingSolution.hpp>
////////////////////////////////////////////////////////////////////////
//! \file Zoltan2_AlgSpectral.hpp
//! \brief Spectral ordering of a graph (local or global).
//! \brief Sorts the Fiedler vector of the graph Laplacian.
namespace Zoltan2{
template <typename Adapter>
int AlgSpectral(
const RCP<GraphModel<Adapter> > &model,
//const RCP<Adapter> &matrixadapter, // Hack: Use matrix adapter directly
const RCP<OrderingSolution<typename Adapter::lno_t,
typename Adapter::gno_t> > &solution,
const RCP<Teuchos::ParameterList> &pl,
const RCP<const Teuchos::Comm<int> > &comm
)
{
#ifndef INCLUDE_ZOLTAN2_EXPERIMENTAL
Z2_THROW_EXPERIMENTAL("Zoltan2 Spectral ordering is strictly "
"experimental software "
"while it is being developed and tested.")
#else //INCLUDE_ZOLTAN2_EXPERIMENTAL
typedef typename Adapter::lno_t lno_t;
typedef typename Adapter::gno_t gno_t;
typedef typename Adapter::scalar_t scalar_t;
int ierr= 0;
HELLO;
// TODO: Check params to do local or global ordering.
bool localOrder = true;
const size_t nVtx = model->getLocalNumVertices();
lno_t *perm = solution->getPermutationView();
for (lno_t i=0; i<nVtx; i++){
perm[i] = -1;
}
// Get local graph.
ArrayView<const gno_t> edgeIds;
ArrayView<const lno_t> offsets;
ArrayView<StridedData<lno_t, scalar_t> > wgts;
model->getEdgeList(edgeIds, offsets, wgts);
//cout << "Debug: Local graph from getLocalEdgeList" << endl;
//cout << "edgeIds: " << edgeIds << endl;
//cout << "offsets: " << offsets << endl;
// Form the graph Laplacian: L = D-A
// Create a new Tpetra matrix, but use views of existing data when possible.
// TODO
// TODO: Find smallest eigenvalues using Anasazi
// TODO: Sort Fiedler vector.
solution->setHavePerm(true);
return ierr;
#endif // INCLUDE_ZOLTAN2_EXPERIMENTAL
}
}
#endif
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