Representations

QuikGraph provides various data structures that can represent directed/undirected dense/sparse graphs. All data structures are serializable, cloneable and not thread safe.

Graphs are mutable or immutable (immutable graphs usually have a more compact representation). The delegate based graphs can be used to keep the memory consumption low.

• Directed graphs
  • AdjacencyGraph provides access to vertices, edges and out-edges of sparse directed graphs.
  • BidirectionalGraph extends AdjacencyGraph by providing access to in-edges but it requires the double of memory space.
  • BidirectionalMatrixGraph represented by an array. Efficient for dense directed graphs with known number of vertices.
  • ArrayAdjacencyGraph and ArrayBidirectionalGraph are read only equivalent of AdjacencyGraph and BidirectionalGraph. They also use slightly less memory.
  • CompressedSparseRowGraph is an adjacency graph using a compact representation called compressed sparse row. Only the vertex can be of custom type.
  • DelegateImplicitGraph wraps the IImplicitGraph interface on top of a delegate that a vertex to a set of out vertices. This representation is efficient for large graph that cannot be stored in memory at once.
  • DelegateIncidenceGraph wraps the IIncidenceGraph interface, and extends DelegateImplicitGraph.
  • DelegateVertexAndEdgeListGraph wraps the IVertexAndEdgeListGraph, extends the DelegateIncidenceGraph, and also uses an enumeration for the vertices.
• Undirected graphs
  • UndirectedGraph provides a representation for sparse undirected graphs.
• Adapters
  • BidirectionalAdapterGraph wraps an adjacency graph into a bidirectional graph (access to in-edges).
  • UndirectedBidirectionalGraph wraps a bidirectional graph into a undirected graph