Intersection of graphsSource:
The intersection of two or more graphs are created. The graphs may have identical or overlapping vertex sets.
# S3 method for igraph intersection(..., byname = "auto", keep.all.vertices = TRUE)
Graph objects or lists of graph objects.
A logical scalar, or the character scalar
auto. Whether to perform the operation based on symbolic vertex names. If it is
auto, that means
TRUEif all graphs are named and
FALSEotherwise. A warning is generated if
autoand some (but not all) graphs are named.
Logical scalar, whether to keep vertices that only appear in a subset of the input graphs.
intersection() creates the intersection of two or more graphs:
only edges present in all graphs will be included. The corresponding
byname argument is
auto and all graphs
are named), then the operation is performed on symbolic vertex names instead
of the internal numeric vertex ids.
intersection() keeps the attributes of all graphs. All graph,
vertex and edge attributes are copied to the result. If an attribute is
present in multiple graphs and would result a name clash, then this
attribute is renamed by adding suffixes: _1, _2, etc.
name vertex attribute is treated specially if the operation is
performed based on symbolic vertex names. In this case
name must be
present in all graphs, and it is not renamed in the result graph.
An error is generated if some input graphs are directed and others are undirected.
Other functions for manipulating graph structure:
Gabor Csardi firstname.lastname@example.org
## Common part of two social networks net1 <- graph_from_literal( D - A:B:F:G, A - C - F - A, B - E - G - B, A - B, F - G, H - F:G, H - I - J ) net2 <- graph_from_literal(D - A:F:Y, B - A - X - F - H - Z, F - Y) print_all(net1 %s% net2) #> IGRAPH 3726c92 UN-- 13 4 -- #> + attr: name (v/c) #> + vertex attributes: #> | name #> |  D #> |  A #> |  B #> |  F #> |  G #> |  C #> |  E #> |  H #> |  I #> |  J #> |  Y #> |  X #> |  Z #> + edges from 3726c92 (vertex names): #>  F--H A--B D--F D--A