Package org.jgrapht.generate

Class GnpRandomBipartiteGraphGenerator<V,E>

java.lang.Object

org.jgrapht.generate.GnpRandomBipartiteGraphGenerator<V,E>

Type Parameters:

V - the graph vertex type

E - the graph edge type

All Implemented Interfaces:

GraphGenerator<V,E,V>

public class GnpRandomBipartiteGraphGenerator<V,E>
extends Object
implements GraphGenerator<V,E,V>

Create a random bipartite graph based on the $G(n, p)$ Erdős–Rényi model. See the Wikipedia article for details and references about Random Graphs and the Erdős–Rényi model . The user provides the sizes $n_1$ and $n_2$ of the two partitions $(n1+n2=n)$ and the probability $p$ of the existence of an edge. The generator supports both directed and undirected graphs.

Author:

Dimitrios Michail

See Also:

GnmRandomBipartiteGraphGenerator

Constructor Summary

Constructors

Constructor	Description
GnpRandomBipartiteGraphGenerator(int n1, int n2, double p)	Create a new random bipartite graph generator.
GnpRandomBipartiteGraphGenerator(int n1, int n2, double p, long seed)	Create a new random bipartite graph generator.
GnpRandomBipartiteGraphGenerator(int n1, int n2, double p, Random rng)	Create a new random bipartite graph generator.

Method Summary

Modifier and Type	Method	Description
void	generateGraph(Graph<V,E> target, Map<String,V> resultMap)	Generates a random bipartite graph.
Set<V>	getFirstPartition()	Returns the first partition of vertices in the bipartite graph.
Set<V>	getSecondPartition()	Returns the second partitions of vertices in the bipartite graph.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.jgrapht.generate.GraphGenerator

generateGraph

Constructor Detail

GnpRandomBipartiteGraphGenerator

public GnpRandomBipartiteGraphGenerator(int n1,
                                        int n2,
                                        double p)

Create a new random bipartite graph generator. The generator uses the $G(n, p)$ model when $n = n_1 + n_2$ and the bipartite graph has one partition with size $n_1$ and one partition with size $n_2$. An edge between two vertices of different partitions is included with probability $p$ independent of all other edges.

Parameters:

n1 - number of vertices of the first partition

n2 - number of vertices of the second partition

p - edge probability

GnpRandomBipartiteGraphGenerator

public GnpRandomBipartiteGraphGenerator(int n1,
                                        int n2,
                                        double p,
                                        long seed)

Create a new random bipartite graph generator. The generator uses the $G(n, p)$ model when $n = n_1 + n_2$, the bipartite graph has partition with size $n_1$ and a partition with size $n_2$. An edge between two vertices of different partitions is included with probability $p$ independent of all other edges.

Parameters:

n1 - number of vertices of the first partition

n2 - number of vertices of the second partition

p - edge probability

seed - seed for the random number generator

GnpRandomBipartiteGraphGenerator

public GnpRandomBipartiteGraphGenerator(int n1,
                                        int n2,
                                        double p,
                                        Random rng)

Create a new random bipartite graph generator. The generator uses the $G(n, p)$ model when $n = n_1 + n_2$, the bipartite graph has partition with size $n_1$ and a partition with size $n_2$. An edge between two vertices of different partitions is included with probability $p$ independent of all other edges.

Parameters:

n1 - number of vertices of the first partition

n2 - number of vertices of the second partition

p - edge probability

rng - random number generator

Method Detail

generateGraph

public void generateGraph(Graph<V,E> target,
                          Map<String,V> resultMap)

Generates a random bipartite graph.

Specified by:

generateGraph in interface GraphGenerator<V,E,V>

Parameters:

target - the target graph

resultMap - not used by this generator, can be null

getFirstPartition

public Set<V> getFirstPartition()

Returns the first partition of vertices in the bipartite graph. This partition is guaranteed to be smaller than or equal in size to the second partition.

Returns:

one partition of the bipartite graph

getSecondPartition

public Set<V> getSecondPartition()

Returns the second partitions of vertices in the bipartite graph. This partition is guaranteed to be larger than or equal in size to the first partition.

Returns:

one partition of the bipartite graph