# add_edges

From igraph v1.0.0
by Gabor Csardi

##### Add edges to a graph

The new edges are given as a vertex sequence, e.g. internal
numeric vertex ids, or vertex names. The first edge points from
`edges[1]`

to `edges[2]`

, the second from `edges[3]`

to `edges[4]`

, etc.

##### Usage

`add_edges(graph, edges, ..., attr = list())`

##### Arguments

- graph
- The input graph
- edges
- The edges to add, a vertex sequence with even number of vertices.
- ...
- Additional arguments, they must be named, and they will be added as edge attributes, for the newly added edges. See also details below.
- attr
- A named list, its elements will be added as edge attributes, for the newly added edges. See also details below.

##### Details

If attributes are supplied, and they are not present in the graph,
their values for the original edges of the graph are set to `NA`

.

##### Value

- The graph, with the edges (and attributes) added.

##### See Also

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

;
`-.igraph`

, `igraph-minus`

;
`add.vertices`

, `add_vertices`

;
`delete.edges`

, `delete_edges`

;
`delete.vertices`

,
`delete_vertices`

; `edge`

,
`edges`

; `path`

;
`vertex`

, `vertices`

##### Examples

```
g <- make_empty_graph(n = 5) %>%
add_edges(c(1,2, 2,3, 3,4, 4,5)) %>%
set_edge_attr("color", value = "red") %>%
add_edges(c(5,1), color = "green")
E(g)[[]]
plot(g)
```

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

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