Documentation

Overview

package tarjan implements a graph loop detection algorithm called Tarjan's algorithm.

The algorithm takes a input graph and produces a slice where each item is a slice of strongly connected vertices. The input graph is in form of a map where the key is a graph vertex and the value is the edges in for of a slice of vertices.

Algorithm description: http://en.wikipedia.org/wiki/Tarjan’s_strongly_connected_components_algorithm

Based on an implementation by Gustavo Niemeyer (in mgo/txn): http://bazaar.launchpad.net/+branch/mgo/v2/view/head:/txn/tarjan.go

Index

• func Connections(graph map[interface{}][]interface{}) [][]interface{}

Examples

• Connections

Constants

This section is empty.

Variables

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Functions

func Connections

func Connections(graph map[interface{}][]interface{}) [][]interface{}

Connections creates a slice where each item is a slice of strongly connected vertices.

If a slice item contains only one vertex there are no loops. A loop on the vertex itself is also a connected group.

The example shows the same graph as in the Wikipedia article.

Example

graph := make(map[interface{}][]interface{}) graph["1"] = []interface{}{"2"} graph["2"] = []interface{}{"3"} graph["3"] = []interface{}{"1"} graph["4"] = []interface{}{"2", "3", "5"} graph["5"] = []interface{}{"4", "6"} graph["6"] = []interface{}{"3", "7"} graph["7"] = []interface{}{"6"} graph["8"] = []interface{}{"5", "7", "8"} o := Connections(graph) output := sortConnections(o) fmt.Println(output)

Output:

[[1 2 3] [6 7] [4 5] [8]]

Types

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