Igraph Random Graph
Igraph Random Graph
I want to create a graph in python using Igraph. I did not create the edges. I want to know how to create the random edges between the nodes that have already been created. I tried to use Graph.GRG but it did not work.
Graph.GRG
g.add_vertices(3)
g.add_vertices(3)
1 Answer
1
g.add_edges() is what you need. This method takes a list of pairs of vertex numbers. Here is a simple example:
g.add_edges()
from igraph import *
import random
## Generate graph with 8 vertices and no edges
g = Graph()
g.add_vertices(8)
## Now generate random edges
random.seed(123)
RandEdges =
for x in range(1, 13):
RandEdges.append(random.sample(range(0,g.vcount()), 2))
RandEdges
[[0, 2],
[1, 6],
[6, 2],
[1, 6],
[0, 3],
[5, 2],
[0, 1],
[2, 7],
[5, 7],
[3, 1],
[0, 3],
[1, 4]]
With this format, you can add the edges.
## Add edges and plot
g.add_edges(RandEdges)
plot(g)
Some additional examples of adding edges are available in the igraph tutorial
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