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MueLu_IsolatedNodeAggregationAlgorithm_def.hpp
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46 /*
47  * MueLu_IsolatedNodeAggregationAlgorithm_def.hpp
48  *
49  * Created on: Mar 4, 2013
50  * Author: wiesner
51  */
52 
53 #ifndef MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_DEF_HPP_
54 #define MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_DEF_HPP_
55 
56 
57 #include <Teuchos_Comm.hpp>
58 #include <Teuchos_CommHelpers.hpp>
59 
60 #include <Xpetra_Vector.hpp>
61 
62 #include "MueLu_IsolatedNodeAggregationAlgorithm.hpp"
63 
64 #include "MueLu_GraphBase.hpp"
65 #include "MueLu_Aggregates.hpp"
66 #include "MueLu_Exceptions.hpp"
67 #include "MueLu_Monitor.hpp"
68 
69 namespace MueLu {
70 
71  template <class LocalOrdinal, class GlobalOrdinal, class Node>
72  void IsolatedNodeAggregationAlgorithm<LocalOrdinal, GlobalOrdinal, Node>::BuildAggregates(const ParameterList& /* params */, const GraphBase& graph, Aggregates& /* aggregates */, std::vector<unsigned>& aggStat, LO& numNonAggregatedNodes) const {
73  Monitor m(*this, "BuildAggregates");
74 
75  const LO numRows = graph.GetNodeNumVertices();
76 
77  // Remove all isolated nodes
78  for (LO i = 0; i < numRows; i++)
79  if (aggStat[i] != AGGREGATED && aggStat[i] != IGNORED && graph.getNeighborVertices(i).size() == 1) {
80  aggStat[i] = IGNORED;
81  numNonAggregatedNodes--;
82  }
83  }
84 
85 } // end namespace
86 
87 #endif /* MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_DEF_HPP_ */
Container class for aggregation information.
virtual size_t GetNodeNumVertices() const =0
Return number of vertices owned by the calling node.
void BuildAggregates(const ParameterList &params, const GraphBase &graph, Aggregates &aggregates, std::vector< unsigned > &aggStat, LO &numNonAggregatedNodes) const
Local aggregation.
MueLu representation of a graph.
Timer to be used in non-factories.
virtual Teuchos::ArrayView< const LocalOrdinal > getNeighborVertices(LocalOrdinal v) const =0
Return the list of vertices adjacent to the vertex &#39;v&#39;.