TNGraphMtx Class Reference

#include <gsvd.h>

Inheritance diagram for TNGraphMtx:

Collaboration diagram for TNGraphMtx:

List of all members.

Public Member Functions
	TNGraphMtx (const PNGraph &GraphPt)
	TNGraphMtx (const TNGraphMtx &GraphMtx)
TNGraphMtx &	operator= (const TNGraphMtx &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
PNGraph	Graph

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Detailed Description

Directed 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 5 of file gsvd.h.

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Constructor & Destructor Documentation

TNGraphMtx::TNGraphMtx

(

const PNGraph &

GraphPt

)

Definition at line 10 of file gsvd.cpp.

References CheckNodeIds(), and Graph.

                                             : Graph() { 
  Graph = GraphPt;
  if (! CheckNodeIds()) {
    printf("  Renumbering nodes.\n");
    Graph = TSnap::ConvertGraph<PNGraph>(GraphPt, true);
  }
}

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TNGraphMtx::TNGraphMtx

(

const TNGraphMtx &

GraphMtx

)

[inline]

Definition at line 11 of file gsvd.h.

: Graph(GraphMtx.Graph) { }

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Member Function Documentation

bool TNGraphMtx::CheckNodeIds

(

)

[private]

Definition at line 3 of file gsvd.cpp.

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

Referenced by TNGraphMtx().

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

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TNGraphMtx& TNGraphMtx::operator=

(

const TNGraphMtx &

GraphMtx

)

[inline]

Definition at line 12 of file gsvd.h.

References Graph.

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

int TNGraphMtx::PGetCols

(

)

const [inline, virtual]

Implements TMatrix.

Definition at line 14 of file gsvd.h.

References TNGraph::GetNodes(), and Graph.

{ return Graph->GetNodes(); }

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int TNGraphMtx::PGetRows

(

)

const [inline, virtual]

Implements TMatrix.

Definition at line 13 of file gsvd.h.

References TNGraph::GetNodes(), and Graph.

{ return Graph->GetNodes(); }

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

Implements TMatrix.

Definition at line 19 of file gsvd.cpp.

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

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

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

Implements TMatrix.

Definition at line 33 of file gsvd.cpp.

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

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

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

Implements TMatrix.

Definition at line 47 of file gsvd.cpp.

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

                                                                           {
  const int ColN = GetCols();
  Assert(B.GetRows() >= ColN && Result.Len() >= ColN);
  const THash<TInt, TNGraph::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].OutNIdV;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[RowV[i]] += B(j, ColId);
    }
  }
}

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

Implements TMatrix.

Definition at line 61 of file gsvd.cpp.

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

                                                                 {
  const int RowN = GetRows();
  Assert(Vec.Len() >= RowN && Result.Len() >= RowN);
  const THash<TInt, TNGraph::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].OutNIdV;
    for (int i = 0; i < RowV.Len(); i++) {
      Result[RowV[i]] += Vec[j];
    }
  }
}

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Member Data Documentation

PNGraph TNGraphMtx::Graph [private]

Definition at line 7 of file gsvd.h.

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

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

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