# R igraph manual pages

Use this if you are using igraph from R

## Degree and degree distribution of the vertices

### Description

The degree of a vertex is its most basic structural property, the number of its adjacent edges.

### Usage

```degree(graph, v = V(graph), mode = c("all", "out", "in", "total"),
loops = TRUE, normalized = FALSE)

degree_distribution(graph, cumulative = FALSE, ...)
```

### Arguments

 `graph` The graph to analyze. `v` The ids of vertices of which the degree will be calculated. `mode` Character string, “out” for out-degree, “in” for in-degree or “total” for the sum of the two. For undirected graphs this argument is ignored. “all” is a synonym of “total”. `loops` Logical; whether the loop edges are also counted. `normalized` Logical scalar, whether to normalize the degree. If `TRUE` then the result is divided by n-1, where n is the number of vertices in the graph. `cumulative` Logical; whether the cumulative degree distribution is to be calculated. `...` Additional arguments to pass to `degree`, eg. `mode` is useful but also `v` and `loops` make sense.

### Value

For `degree` a numeric vector of the same length as argument `v`.

For `degree_distribution` a numeric vector of the same length as the maximum degree plus one. The first element is the relative frequency zero degree vertices, the second vertices with degree one, etc.

### Author(s)

Gabor Csardi csardi.gabor@gmail.com

### Examples

```
g <- make_ring(10)
degree(g)
g2 <- sample_gnp(1000, 10/1000)
degree_distribution(g2)

```

[Package igraph version 1.2.4 Index]