How do I create a cycle graph with igraph?-CodePudding

How do I create a cycle graph on n nodes with igraph, either in R or Python?

It should look like this, but for an arbitrary number of nodes:

EDIT: Since it was requested that I should add a code attempt, here's one possibility in R that I found to be too complicated:

n <- 5 
make_graph( c(tail(rep(1:n, each=2), -1), 1) )

CodePudding user response：

In R with n vertices:

n <- 8

seq_len(n) %>%
  {c(head(., -1), tail(., -1))} %>%
  matrix(ncol = 2) %>%
  rbind(c(n, 1)) %>%
  graph_from_edgelist(directed = FALSE)

CodePudding user response：

for python you need to install:

pip install python-igraph
pip install pycairo

Then you can use Graph.Ring from igraph like below:

import igraph as ig
nodes = 5
g = ig.Graph.Ring(n=nodes, circular=True)
ig.plot(g,vertex_label = range(1,nodes 1))

In R, the relevant igraph function is

CodePudding user response：

Try make_ring if you are using igraph with R

plot(make_ring(5))