bottleneck: Find the BottleNeck centrality score

In centiserve: Find Graph Centrality Indices

Description

BottleNeck Centrality for vertex v defined as:

BN(v) = sum(P(s)(v), s in v)

Let T(s) be a shortest path tree rooted at node s. P(s)(v) = 1 if more than |V(T(s))|/4 paths from node s to other nodes in T(s) meet at the vertex v, otherwise P(s)(v) = 0.

Usage

bottleneck(graph, vids = V(graph), mode = c("all", "out", "in"))

Arguments

graph	The input graph as igraph object
vids	Vertex sequence, the vertices for which the centrality values are returned. Default is all vertices.
mode	Character constant, gives whether the shortest paths to or from the given vertices should be calculated for directed graphs. If out then the shortest paths from the vertex, if in then to it will be considered. If all, the default, then the corresponding undirected graph will be used, ie. not directed paths are searched. This argument is ignored for undirected graphs.

Details

For each node v in the graph, construct a tree T(v) of shortest paths from that node to all other nodes in the graph. For a node v, n(v) is the number of nodes that are directly or indirectly connected to node v (i.e. the tree T(v) contains n(v) nodes). So extract all nodes w on the above defined tree T(v) of shortest paths from node v, such that more than n(v)/4 paths from v to other nodes in the tree meet at node w. Nodes w extracted in this way represent 'bottle necks' of the shortest path tree T(v) rooted at node v, since at least n(v)/4 paths of the n(v)-node tree T(v) 'meet' at w.
More detail at BottleNeck

Value

A numeric vector contaning the centrality scores for the selected vertices.

Author(s)

Mahdi Jalili [e-mail]

References

Przulj, N., Dennis A. Wigle, and Igor Jurisica. "Functional topology in a network of protein interactions." Bioinformatics 20.3 (2004): 340-348.

Examples

g <- graph(c(1,2,2,3,3,4,4,2))
bottleneck(g)

Example output

Loading required package: igraph

Attaching package: 'igraph'

The following objects are masked from 'package:stats':

    decompose, spectrum

The following object is masked from 'package:base':

    union

Loading required package: Matrix
[1] 0 3 0 0

centiserve documentation built on May 2, 2019, 6:01 a.m.