# extractPath

##### convert a dijkstra.sp predecessor structure into the path joining two nodes

determine a path between two nodes in a graph,
using output of `dijkstra.sp`

.

- Keywords
- models

##### Usage

`extractPath(s, f, pens)`

##### Arguments

- s
- index of starting node in nodes vector
of the graph from which
`pens`

was derived - f
- index of ending node in nodes vector
- pens
- predecessor index vector as returned
in the
`preds`

component of`dijkstra.sp`

output

##### References

Boost Graph Library ( www.boost.org/libs/graph/doc/index.html )

The Boost Graph Library: User Guide and Reference Manual; by Jeremy G. Siek, Lie-Quan Lee, and Andrew Lumsdaine; (Addison-Wesley, Pearson Education Inc., 2002), xxiv+321pp. ISBN 0-201-72914-8

##### See Also

##### Examples

```
data(FileDep)
dd <- dijkstra.sp(FileDep)
extractPath(1,9,dd$pen)
```

*Documentation reproduced from package RBGL, version 1.48.1, License: Artistic-2.0*

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