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Counting vertices and edges

A lot of basic information about a network can be extracted from an igraph object. In this exercise you will learn how to count the vertices and edges from a network by applying several functions to the graph object g.

Each row of the friends dataframe represents an edge in the network.

This exercise is part of the course

Network Analysis in R

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Exercise instructions

  • Use V() and E() to view the vertices and edges respectively of the network.
  • Use gsize() to count the number of edges in a network.
  • Use gorder() to count the number of vertices in a network.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Load igraph
library(igraph)

# Subset vertices and edges
V(___)
E(___)

# Count number of edges
gsize(___)

# Count number of vertices
____(g)
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