TUNGraphMtx Class Reference

#include <gsvd.h>

Inheritance diagram for TUNGraphMtx:

Collaboration diagram for TUNGraphMtx:

List of all members.

Public Member Functions
	TUNGraphMtx (const PUNGraph &GraphPt)
	TUNGraphMtx (const TUNGraphMtx &GraphMtx)
TUNGraphMtx &	operator= (const TUNGraphMtx &GraphMtx)
int	PGetRows () const
int	PGetCols () const
void	PMultiply (const TFltVV &B, int ColId, TFltV &Result) const
void	PMultiply (const TFltV &Vec, TFltV &Result) const
void	PMultiplyT (const TFltVV &B, int ColId, TFltV &Result) const
void	PMultiplyT (const TFltV &Vec, TFltV &Result) const
Private Member Functions
bool	CheckNodeIds ()
Private Attributes
PUNGraph	Graph

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Detailed Description

Undirected Graph Adjacency Matrix represented as sparse {0,1} row matrix. The class is used for computing spectral properties of graph adjacency matrices. The class assumes that node IDs have the range 0...Nodes-1.

Definition at line 29 of file gsvd.h.

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Constructor & Destructor Documentation

TUNGraphMtx::TUNGraphMtx

(

const PUNGraph &

GraphPt

)

Definition at line 83 of file gsvd.cpp.

References CheckNodeIds(), TUNGraph::GetNodes(), and Graph.

                                                : Graph() { 
  Graph = GraphPt;
  if (! CheckNodeIds()) {
    printf("  Renumbering %d nodes....", GraphPt->GetNodes());
    TExeTm ExeTm;
    Graph = TSnap::ConvertGraph<PUNGraph>(GraphPt, true);
    /*TIntSet NIdSet;
    for (TUNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
      NIdSet.AddKey(NI.GetId());
    }
    Graph = TUNGraph::New();  *Graph = *GraphPt; */
    printf("done [%s]\n", ExeTm.GetStr());
  }
}

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TUNGraphMtx::TUNGraphMtx

(

const TUNGraphMtx &

GraphMtx

)

[inline]

Definition at line 35 of file gsvd.h.

: Graph(GraphMtx.Graph) { }

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Member Function Documentation

bool TUNGraphMtx::CheckNodeIds

(

)

[private]

Definition at line 76 of file gsvd.cpp.

References TUNGraph::GetNodes(), Graph, and TUNGraph::IsNode().

Referenced by TUNGraphMtx().

                               {
  for (int NId = 0; NId < Graph->GetNodes(); NId++) {
    if (! Graph->IsNode(NId)) { return false; }
  }
  return true;
}

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TUNGraphMtx& TUNGraphMtx::operator=

(

const TUNGraphMtx &

GraphMtx

)

[inline]

Definition at line 36 of file gsvd.h.

References Graph.

{ Graph=GraphMtx.Graph;  return *this; }

int TUNGraphMtx::PGetCols

(

)

const [inline, virtual]

Implements TMatrix.

Definition at line 38 of file gsvd.h.

References TUNGraph::GetNodes(), and Graph.

{ return Graph->GetNodes(); }

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int TUNGraphMtx::PGetRows

(

)

const [inline, virtual]

Implements TMatrix.

Definition at line 37 of file gsvd.h.

References TUNGraph::GetNodes(), and Graph.

{ return Graph->GetNodes(); }

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void TUNGraphMtx::PMultiply	(	const TFltVV &	B,
		int	ColId,
		TFltV &	Result
	)		const [virtual]

Implements TMatrix.

Definition at line 99 of file gsvd.cpp.

References Assert, TMatrix::GetRows(), TVVec< TVal >::GetRows(), Graph, TVec< TVal, TSizeTy >::Len(), and TUNGraph::NodeH.

                                                                           {
  const int RowN = GetRows();
  Assert(B.GetRows() >= RowN && Result.Len() >= RowN);
  const THash<TInt, TUNGraph::TNode>& NodeH = Graph->NodeH;
  for (int j = 0; j < RowN; j++) {
    const TIntV& RowV = NodeH[j].NIdV;
    Result[j] = 0.0;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[j] += B(RowV[i], ColId);
    }
  }
}

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void TUNGraphMtx::PMultiply	(	const TFltV &	Vec,
		TFltV &	Result
	)		const [virtual]

Implements TMatrix.

Definition at line 113 of file gsvd.cpp.

References Assert, TMatrix::GetRows(), Graph, TVec< TVal, TSizeTy >::Len(), and TUNGraph::NodeH.

                                                                 {
  const int RowN = GetRows();
  Assert(Vec.Len() >= RowN && Result.Len() >= RowN);
  const THash<TInt, TUNGraph::TNode>& NodeH = Graph->NodeH;
  for (int j = 0; j < RowN; j++) {
    const TIntV& RowV = NodeH[j].NIdV;
    Result[j] = 0.0;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[j] += Vec[RowV[i]];
    }
  }
}

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void TUNGraphMtx::PMultiplyT	(	const TFltVV &	B,
		int	ColId,
		TFltV &	Result
	)		const [virtual]

Implements TMatrix.

Definition at line 127 of file gsvd.cpp.

References Assert, TMatrix::GetCols(), TVVec< TVal >::GetRows(), Graph, TVec< TVal, TSizeTy >::Len(), and TUNGraph::NodeH.

                                                                            {
  const int ColN = GetCols();
  Assert(B.GetRows() >= ColN && Result.Len() >= ColN);
  const THash<TInt, TUNGraph::TNode>& NodeH = Graph->NodeH;
  for (int i = 0; i < ColN; i++) Result[i] = 0.0;
  for (int j = 0; j < ColN; j++) {
    const TIntV& RowV = NodeH[j].NIdV;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[RowV[i]] += B(j, ColId);
    }
  }
}

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void TUNGraphMtx::PMultiplyT	(	const TFltV &	Vec,
		TFltV &	Result
	)		const [virtual]

Implements TMatrix.

Definition at line 141 of file gsvd.cpp.

References Assert, TMatrix::GetRows(), Graph, TVec< TVal, TSizeTy >::Len(), and TUNGraph::NodeH.

                                                                  {
  const int RowN = GetRows();
  Assert(Vec.Len() >= RowN && Result.Len() >= RowN);
  const THash<TInt, TUNGraph::TNode>& NodeH = Graph->NodeH;
  for (int i = 0; i < RowN; i++) Result[i] = 0.0;
  for (int j = 0; j < RowN; j++) {
    const TIntV& RowV = NodeH[j].NIdV;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[RowV[i]] += Vec[j];
    }
  }
}

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Member Data Documentation

PUNGraph TUNGraphMtx::Graph [private]

Definition at line 31 of file gsvd.h.

Referenced by CheckNodeIds(), operator=(), PGetCols(), PGetRows(), PMultiply(), PMultiplyT(), and TUNGraphMtx().

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The documentation for this class was generated from the following files:

• snap-core/gsvd.h
• snap-core/gsvd.cpp