Use this if you are using igraph from R
Delete vertices or edges from a graph
## S3 method for class 'igraph' e1 - e2
e1 |
Left argument, see details below. |
e2 |
Right argument, see details below. |
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")
An igraph graph.
Other functions for manipulating graph structure: +.igraph
,
add_edges
, add_vertices
,
delete_edges
,
delete_vertices
, edge
,
path
, vertex