Exercise

# Build and explore the network (part 1)

In this exercise, you are going to begin using the `igraph`

package. This package lets you analyze data that are represented as networks, which are also called *graphs* by mathematicians. In particular, you will learn how to build a network from a data frame and explore the nodes and ties of the network.

For your convenience, the package `igraph`

and the data frames `nodes`

and `ties`

are already loaded into the workspace.

Instructions

**100 XP**

- Use
`graph_from_data_frame()`

to create a network.- The first argument is the data frame of ties.
- The
`directed`

argument is whether or not to make this a directed graph. This should be`FALSE`

. - The
`vertices`

argument is the data frame of nodes.

- Explore the nodes in
`g`

.- Call
`V()`

to extract the vertices from`g`

. - Print the number of vertices with
`vcount()`

.

- Call
- Explore the ties in
`g`

.- Call
`E()`

to extract the edges from`g`

. - Print the number of edges with
`ecount()`

.

- Call