<｜begin▁of▁sentence｜>### Instruction:
As a dental hygienist, imagine that a patient has come in for a routine examination. After evaluating their oral health, you want to use a specialized tool to calculate the Laplacian matrix of their dental structure in order to analyze potential issues and provide preventive care. This tool is called the laplacian function in the igraph library, and it will help you gain insights into the overall health of the patient's teeth and gums.
### Response:
import igraph as ig

# Load a graph from a file
g = ig.read('graph_file.gml')

# Compute the Laplacian matrix
laplacian_matrix = g.laplacian()

# Print the Laplacian matrix
print('Laplacian matrix:')
print(laplacian_matrix)
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