Delete vertices or edges from a graph

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.

Value

An igraph graph.

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")

See also

Other functions for manipulating graph structure: +.igraph(), add_edges(), add_vertices(), complementer(), compose(), connect(), contract(), delete_edges(), delete_vertices(), difference(), difference.igraph(), disjoint_union(), edge(), intersection(), intersection.igraph(), path(), permute(), rep.igraph(), reverse_edges(), simplify(), union(), union.igraph(), vertex()