The `spTreeDijkstra`

function computes the shortest
path tree of an undirected or directed graph with
Dijkstra's algorithm.

1 | ```
spTreeDijkstra(nodes, arcs, source.node = 1, directed = TRUE)
``` |

`nodes` |
vector containing the nodes of the graph,
identified by a number that goes from |

`arcs` |
matrix with the list of arcs of the graph. Each row represents one arc. The first two columns contain the two endpoints of each arc and the third column contains their weights. |

`source.node` |
number pointing the source node of the
graph. It's node |

`directed` |
logical value indicating whether the
graph is directed ( |

Dijkstra's algorithm was developed by the computer scientist Edsger Dijkstra in 1956 and published in 1959. This is an algorithm that can computes a shortest path tree from a given source node to the others nodes that make a connected graph, directed or not, with non-negative weights.

`spTreeDijkstra`

returns a list with:

`tree.nodes` |
vector containing the nodes of the shortest path tree. |

`tree.arcs` |
matrix containing the list of arcs of the shortest path tree. |

`stages` |
number of stages required. |

`distances` |
vector with distances from source to other nodes |

Dijkstra, E. W. (1959). "A note on two problems in connexion with graphs". Numerische Mathematik 1, 269-271.

A more general function getShortestPathTree.

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