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List all (s,t)-cuts of a graph

Description

List all (s,t)-cuts in a directed graph.

Usage

st_cuts(graph, source, target)

Arguments

graph

The input graph. It must be directed.

source

The source vertex.

target

The target vertex.

Details

Given a G directed graph and two, different and non-ajacent vertices, s and t, an (s,t)-cut is a set of edges, such that after removing these edges from G there is no directed path from s to t.

Value

A list with entries:

cuts

A list of numeric vectors containing edge ids. Each vector is an (s,t)-cut.

partition1s

A list of numeric vectors containing vertex ids, they correspond to the edge cuts. Each vertex set is a generator of the corresponding cut, i.e. in the graph G=(V,E), the vertex set X and its complementer V-X, generates the cut that contains exactly the edges that go from X to V-X.

Author(s)

Gabor Csardi csardi.gabor@gmail.com

References

JS Provan and DR Shier: A Paradigm for listing (s,t)-cuts in graphs, Algorithmica 15, 351–372, 1996.

See Also

st_min_cuts to list all minimum cuts.

Examples


# A very simple graph
g <- graph_from_literal(a -+ b -+ c -+ d -+ e)
st_cuts(g, source="a", target="e")

# A somewhat more difficult graph
g2 <- graph_from_literal(s --+ a:b, a:b --+ t,
                   a --+ 1:2:3, 1:2:3 --+ b)
st_cuts(g2, source="s", target="t")

[Package igraph version 1.2.4.1 Index]