# edge

From igraph v1.0.0
by Gabor Csardi

##### Helper function for adding and deleting edges

This is a helper function that simplifies adding and deleting edges to/from graphs.

##### Usage

`edge(...)`edges(...)

##### Arguments

- ...
- See details below.

##### Details

`edges`

is an alias for `edge`

.

When adding edges via `+`

, all unnamed arguments of
`edge`

(or `edges`

) are concatenated, and then passed to
`add_edges`

. They are interpreted as pairs of vertex ids,
and an edge will added between each pair. Named arguments will be
used as edge attributes for the new edges.

When deleting edges via `-`

, all arguments of `edge`

(or
`edges`

) are concatenated via `c()`

and passed to
`delete_edges`

.

##### Value

- A special object that can be used with together with igraph graphs and the plus and minus operators.

##### See Also

Other functions for manipulating graph structure: `+.igraph`

;
`-.igraph`

, `igraph-minus`

;
`add.edges`

, `add_edges`

;
`add.vertices`

, `add_vertices`

;
`delete.edges`

, `delete_edges`

;
`delete.vertices`

,
`delete_vertices`

; `path`

;
`vertex`

, `vertices`

##### Examples

```
g <- make_ring(10) %>%
set_edge_attr("color", value = "red")
g <- g + edge(1, 5, color = "green") +
edge(2, 6, color = "blue") -
edge("8|9")
E(g)[[]]
g %>%
add_layout_(in_circle()) %>%
plot()
g <- make_ring(10) + edges(1:10)
plot(g)
```

*Documentation reproduced from package igraph, version 1.0.0, License: GPL (>= 2)*

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