Use this if you are using igraph from R
difference.igraph {igraph} | R Documentation |
The difference of two graphs are created.
## S3 method for class 'igraph'
difference(big, small, byname = "auto", ...)
big |
The left hand side argument of the minus operator. A directed or undirected graph. |
small |
The right hand side argument of the minus operator. A directed ot undirected graph. |
byname |
A logical scalar, or the character scalar |
... |
Ignored, included for S3 compatibility. |
difference
creates the difference of two graphs. Only edges
present in the first graph but not in the second will be be included in the
new graph. The corresponding operator is %m%.
If the byname
argument is TRUE
(or auto
and the graphs
are all named), then the operation is performed based on symbolic vertex
names. Otherwise numeric vertex ids are used.
difference
keeps all attributes (graph, vertex and edge) of the
first graph.
Note that big
and small
must both be directed or both be
undirected, otherwise an error message is given.
A new graph object.
Gabor Csardi csardi.gabor@gmail.com
## Create a wheel graph
wheel <- union(make_ring(10),
make_star(11, center=11, mode="undirected"))
V(wheel)$name <- letters[seq_len(vcount(wheel))]
## Subtract a star graph from it
sstar <- make_star(6, center=6, mode="undirected")
V(sstar)$name <- letters[c(1,3,5,7,9,11)]
G <- wheel %m% sstar
print_all(G)
plot(G, layout=layout_nicely(wheel))