Class: Doodl::BellmanFord

Inherits:
Object
  • Object
show all
Includes:
SingleSourceShortestPath
Defined in:
lib/shortest_path/bellman_ford.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from SingleSourceShortestPath

#edge_path_to, #node_path_to

Constructor Details

#initialize(graph, source, weight = nil) ⇒ BellmanFord

Returns a new instance of BellmanFord.

Raises:

  • (ArgumentError) 


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# File 'lib/shortest_path/bellman_ford.rb', line 12

def initialize(graph, source, weight = nil)
  raise ArgumentError unless graph.is_a?(Graph)
  raise ArgumentError unless graph.contains_node?(source)
  @dist, @prev = {}, {}
  @graph, @source, = graph, source
  if weight
    @weight = weight
  else
    @weight = Hash.new(1)
  end
  init_maps
  main_algorithm
  check_for_negative_cyles
end

Instance Attribute Details

#dist ⇒ Object (readonly)

Returns the value of attribute dist.



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# File 'lib/shortest_path/bellman_ford.rb', line 11

def dist
  @dist
end

#prev ⇒ Object (readonly)

Returns the value of attribute prev.



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# File 'lib/shortest_path/bellman_ford.rb', line 11

def prev
  @prev
end