The union of two or more graphs are created. The graphs are assumed to have disjoint vertex sets.
disjoint_union(...) x %du% y
Graph objects or lists of graph objects.
disjoint_union() creates a union of two or more disjoint graphs.
Thus first the vertices in the second, third, etc. graphs are relabeled to
have completely disjoint graphs. Then a simple union is created. This
function can also be used via the
graph.disjont.union handles graph, vertex and edge attributes. In
particular, it merges vertex and edge attributes using the basic
function. For graphs that lack some vertex/edge attribute, the corresponding
values in the new graph are set to
NA. Graph attributes are simply
copied to the result. If this would result a name clash, then they are
renamed by adding suffixes: _1, _2, etc.
Note that if both graphs have vertex names (i.e. a
attribute), then the concatenated vertex names might be non-unique in the
result. A warning is given if this happens.
An error is generated if some input graphs are directed and others are undirected.
A new graph object.
Gabor Csardi firstname.lastname@example.org
Other functions for manipulating graph structure:
## A star and a ring g1 <- make_star(10, mode = "undirected") V(g1)$name <- letters[1:10] g2 <- make_ring(10) V(g2)$name <- letters[11:20] print_all(g1 %du% g2)
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