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Directed igraph objects

In this exercise you will learn how to create a directed graph from a dataframe, how to inspect whether a graph object is directed and/or weighted and how to extract those vertices at the beginning and end of directed edges.

Latihan ini adalah bagian dari kursus

Network Analysis in R

Lihat Kursus

Petunjuk latihan

  • Convert the dataframe measles into an igraph graph object using the function graph_from_data_frame() and ensure that it will be a directed graph by setting the second argument to TRUE.
  • Check if the graph object is directed by using is.directed().
  • Examine whether the edges of the graph object are already weighted by using is.weighted().
  • Subset each vertex from which each edge originates by using head_of(). This function takes two arguments, the first being the graph object and the second the edges to examine. For all edges you can use E(g).

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

library(igraph)

# Get the graph object
g <- ___(measles, directed = ___)

# is the graph directed?
___(g)

# Is the graph weighted?
___(g)

# Where does each edge originate from?
table(___(___, E(g)))
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