# subcomponent

From igraph v1.0.1
by Gabor Csardi

##### In- or out- component of a vertex

Finds all vertices reachable from a given vertex, or the opposite: all vertices from which a given vertex is reachable via a directed path.

- Keywords
- graphs

##### Usage

`subcomponent(graph, v, mode = c("all", "out", "in"))`

##### Arguments

- graph
The graph to analyze.

- v
The vertex to start the search from.

- mode
Character string, either “in”, “out” or “all”. If “in” all vertices from which

`v`

is reachable are listed. If “out” all vertices reachable from`v`

are returned. If “all” returns the union of these. It is ignored for undirected graphs.

##### Details

A breadh-first search is conducted starting from vertex `v`

.

##### Value

Numeric vector, the ids of the vertices in the same component as
`v`

.

##### See Also

##### Examples

```
# NOT RUN {
g <- sample_gnp(100, 1/200)
subcomponent(g, 1, "in")
subcomponent(g, 1, "out")
subcomponent(g, 1, "all")
# }
```

*Documentation reproduced from package igraph, version 1.0.1, License: GPL (>= 2)*

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