<｜begin▁of▁sentence｜>### Instruction:
As a security guard, you are often responsible for monitoring and protecting the premises to prevent theft, vandalism, and illegal activities. Just as in security, in the realm of network analysis, we have a similar need to assess the safety and efficiency of a network. With the aid of tools like NetworkX, we can analyze the topology of a network and calculate its radius – the minimum eccentricity of any node in the graph. This allows us to understand the reach of the network and pinpoint the most central locations. Let's consider a practical example to highlight the importance of this analysis.
### Response:
from igraph import Graph

# Define a simple undirected graph
edges = [(0, 1), (1, 2), (2, 3), (3, 4), (4, 0)]
g = Graph(edges)

# Calculate the graph radius
radius = g.radius()
print('Radius of the graph:', radius)
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