This is a helper function that simplifies adding and deleting vertices to/from graphs.
Value
A special object that can be used with together with igraph graphs and the plus and minus operators.
Details
vertices()
is an alias for vertex()
.
When adding vertices via +
, all unnamed arguments are interpreted
as vertex names of the new vertices. Named arguments are interpreted as
vertex attributes for the new vertices.
When deleting vertices via -
, all arguments of vertex()
(or
vertices()
) are concatenated via c()
and passed to
delete_vertices()
.
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()
,
igraph-minus
,
intersection()
,
intersection.igraph()
,
path()
,
permute()
,
rep.igraph()
,
reverse_edges()
,
simplify()
,
union()
,
union.igraph()
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()
,
igraph-minus
,
intersection()
,
intersection.igraph()
,
path()
,
permute()
,
rep.igraph()
,
reverse_edges()
,
simplify()
,
union()
,
union.igraph()
Examples
g <- make_(ring(10), with_vertex_(name = LETTERS[1:10])) +
vertices("X", "Y")
g
#> IGRAPH 5fd4f37 UN-- 12 10 -- Ring graph
#> + attr: name (g/c), mutual (g/l), circular (g/l), name (v/c)
#> + edges from 5fd4f37 (vertex names):
#> [1] A--B B--C C--D D--E E--F F--G G--H H--I I--J A--J
plot(g)