# cocitation

From igraph v0.5.5-3
by Gabor Csardi

##### Cocitation coupling

Two vertices are cocited if there is another vertex citing
both of them. `cocitation`

siply counts how many types two vertices
are cocited. The bibliographic coupling of two vertices is the number
of other vertices they both cite, `bibcoupling`

calculates this.

- Keywords
- graphs

##### Usage

```
cocitation(graph, v=V(graph))
bibcoupling(graph, v=V(graph))
```

##### Arguments

- graph
- The graph object to analyze
- v
- Vertex sequence or numeric vector, the vertex ids for which the cocitation or bibliographic coupling values we want to calculate. The default is all vertices.

##### Details

`cocitation`

calculates the cocitation counts for the vertices in the
`v`

argument and all vertices in the graph.

`bibcoupling`

calculates the bibliographic coupling for vertices
in `v`

and all vertices in the graph.

Calculating the cocitation or bibliographic coupling for only one vertex costs the same amount of computation as for all vertices. This might change in the future.

##### Value

- A numeric matrix with
`length(v)`

lines and`vcount(graph)`

columns. Element`(i,j)`

contains the cocitation or bibliographic coupling for vertices`v[i]`

and`j`

.

##### concept

- Cocication
- Bibliographic coupling

##### Examples

```
g <- graph.ring(10)
cocitation(g)
bibcoupling(g)
```

*Documentation reproduced from package igraph, version 0.5.5-3, License: GPL (>= 2)*

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