# R igraph manual pages

Use this if you are using igraph from R

 igraph-minus {igraph} R Documentation

## Delete vertices or edges from a graph

### Description

Delete vertices or edges from a graph

### Usage

## S3 method for class 'igraph'
e1 - e2


### Arguments

 e1 Left argument, see details below. e2 Right argument, see details below.

### Details

The minus operator (‘-’) can be used to remove vertices or edges from the graph. The operation performed is selected based on the type of the right hand side argument:

• If it is an igraph graph object, then the difference of the two graphs is calculated, see difference.

• If it is a numeric or character vector, then it is interpreted as a vector of vertex ids and the specified vertices will be deleted from the graph. Example:

  g <- make_ring(10)
V(g)$name <- letters[1:10] g <- g - c("a", "b") • If e2 is a vertex sequence (e.g. created by the V function), then these vertices will be deleted from the graph. • If it is an edge sequence (e.g. created by the E function), then these edges will be deleted from the graph. • If it is an object created with the vertex (or the vertices) function, then all arguments of vertices are concatenated and the result is interpreted as a vector of vertex ids. These vertices will be removed from the graph. • If it is an object created with the edge (or the edges) function, then all arguments of edges are concatenated and then interpreted as edges to be removed from the graph. Example:  g <- make_ring(10) V(g)$name <- letters[1:10]
E(g)$name <- LETTERS[1:10] g <- g - edge("e|f") g <- g - edge("H") • If it is an object created with the path function, then all path arguments are concatenated and then interpreted as a path along which edges will be removed from the graph. Example:  g <- make_ring(10) V(g)$name <- letters[1:10]
g <- g - path("a", "b", "c", "d")

### Value

An igraph graph.

Other functions for manipulating graph structure: +.igraph(), add_edges(), add_vertices(), delete_edges(), delete_vertices(), edge(), path(), vertex()