GetInvParticipRat

GetInvParticipRat(Graph, MaxEigVecs, TimeLimit, EigValIprV)

Computes Inverse participation ratio of a given graph.

Parameters:

• Graph: undirected graph (input)

  A Snap.py undirected graph.

• EigVecs: int (input)

  Maximum number of eigenvectors to return.

• TimeLimit: int (input)

  Maximum number seconds to search.

• EigValIprV: TFltPrV, a vector of (float, float) pairs (output)

  The output inverse participation ratios.

Return value:

• None

See Spectra of “real-world” graphs: Beyond the semicircle law by Farkas, Derenyi, Barabasi and Vicsek URL: http://arxiv.org/abs/cond-mat/0102335

The following example computes the inverse participation ratio for TNGraph:

import snap

UGraph = snap.TUNGraph.New()
UGraph.AddNode(1)
UGraph.AddNode(2)
UGraph.AddNode(3)
UGraph.AddNode(4)
UGraph.AddNode(5)
UGraph.AddNode(6)
UGraph.AddEdge(1, 2)
UGraph.AddEdge(2, 3)
UGraph.AddEdge(3, 5)
UGraph.AddEdge(4, 6)
UGraph.AddEdge(4, 1)

EigValIprV = snap.TFltPrV()
snap.GetInvParticipRat(UGraph, 20, 1000, EigValIprV)
for item in EigValIprV:
    print '%f, %f' % (item.GetVal1(), item.GetVal2())