Module: RGL::BidirectionalGraph
 Includes:
 Graph
 Defined in:
 lib/laser/third_party/rgl/bidirectional.rb
Overview
BGL defines the concept BidirectionalGraph as follows:
The BidirectionalGraph concept refines IncidenceGraph and adds the requirement for efficient access to the inedges of each vertex. This concept is separated from IncidenceGraph because, for directed graphs, efficient access to inedges typically requires more storage space, and many algorithms do not require access to inedges. For undirected graphs, this is not an issue; because the in_edges() and out_edges() functions are the same, they both return the edges incident to the vertex.
Instance Method Summary (collapse)

 (Object) degree(v)
Returns the number of inedges plus outedges (for directed graphs) or the number of incident edges (for undirected graphs) of vertex v.

 (Object) each_in_neighbor(v, &blk)
Iterator providing access to the inedges (for directed graphs) or incident edges (for undirected graphs) of vertex v.

 (Object) in_degree(v)
Returns the number of inedges (for directed graphs) or the number of incident edges (for undirected graphs) of vertex v.
Methods included from Graph
#acyclic?, #adjacent_vertices, #bfs_iterator, #bfs_search_tree_from, #build_dfst, #condensation_graph, #depth_first_search, #depth_first_spanning_tree, #depth_first_visit, #dfs_iterator, #directed?, #dominance_frontier, #dominator_tree, #dotty, #each, #each_adjacent, #each_connected_component, #each_edge, #each_vertex, #edge_class, #edges, #edges_filtered_by, #empty?, #eql?, #has_vertex?, #implicit_graph, #iterated_dominance_frontier, #num_edges, #out_degree, #print_dotted_on, #reverse, #size, #strongly_connected_components, #to_adjacency, #to_dot_graph, #to_s, #to_undirected, #topsort_iterator, #transitive_closure, #transitive_reduction, #vertices, #vertices_filtered_by, #write_to_graphic_file
Methods included from Enumerable
#all?, #any?, #chunk, #collect, #collect_concat, #count, #cycle, #detect, #drop, #drop_while, #each_cons, #each_entry, #each_slice, #each_with_index, #each_with_object, #entries, #find_index, #first, #flat_map, #grep, #group_by, #include?, #inject, #map, #max, #max_by, #min, #min_by, #minmax, #minmax_by, #none?, #one?, #partition, #reject, #reverse_each, #select, #slice_before, #sort, #sort_by, #take, #take_while, #to_a, #to_set, #zip
Instance Method Details
 (Object) degree(v)
Returns the number of inedges plus outedges (for directed graphs) or the number of incident edges (for undirected graphs) of vertex v.
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# File 'lib/laser/third_party/rgl/bidirectional.rb', line 35 def degree (v) in_degree(v) + out_degree(v) end 
 (Object) each_in_neighbor(v, &blk)
Iterator providing access to the inedges (for directed graphs) or incident edges (for undirected graphs) of vertex v. For both directed and undirected graphs, the target of an outedge is required to be vertex v and the source is required to be a vertex that is adjacent to v.
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# File 'lib/laser/third_party/rgl/bidirectional.rb', line 21 def each_in_neighbor(v, &blk) each_predecessor(v, &blk) end 
 (Object) in_degree(v)
Returns the number of inedges (for directed graphs) or the number of incident edges (for undirected graphs) of vertex v.
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# File 'lib/laser/third_party/rgl/bidirectional.rb', line 27 def in_degree (v) r = 0; each_in_neighbor(v) { u r += 1} r end 