Data.Graph.Inductive.Query.SP

fgl-5.5.2.3: Martin Erwig's Functional Graph Library

Safe Haskell | Safe
Language | Haskell98

Data.Graph.Inductive.Query.SP

Description

Shortest path algorithms

Synopsis

- spTree :: (Graph gr, Real b) => Node -> gr a b -> LRTree b
- sp :: (Graph gr, Real b) => Node -> Node -> gr a b -> Path
- spLength :: (Graph gr, Real b) => Node -> Node -> gr a b -> b
- dijkstra :: (Graph gr, Real b) => Heap b (LPath b) -> gr a b -> LRTree b
- type LRTree a = [LPath a]
- data Heap a b

# Documentation

spTree :: (Graph gr, Real b) => Node -> gr a b -> LRTree b

Tree of shortest paths from a certain node to the rest of the (reachable) nodes.

Corresponds to `dijkstra` applied to a heap in which the only known node is the starting node, with a path of length 0 leading to it.

sp

Arguments

:: (Graph gr, Real b) |
=> Node | Start
-> Node | Destination
-> gr a b |
-> Path |

Shortest path between two nodes.

spLength

Arguments

:: (Graph gr, Real b) |
=> Node | Start
-> Node | Destination
-> gr a b |
-> b |

Length of the shortest path between two nodes.

dijkstra

Arguments

:: (Graph gr, Real b) |
=> Heap b (LPath b) | Initial heap of known paths and their lengths.
-> gr a b |
-> LRTree b |

Dijkstra's shortest path algorithm.

type LRTree a = [LPath a]

data Heap a b

Instances

(Eq a, Eq b) => Eq (Heap a b) |
(Read a, Read b) => Read (Heap a b) |
(Show a, Show b) => Show (Heap a b) |
(NFData a, NFData b) => NFData (Heap a b) |