Whether to calculate the normalized Laplacian. See
definitions below.
Value
A square matrix with as many rows as the number of vertices in
the input graph.
concept
Graph Laplacian
Details
The Laplacian Matrix of a graph is a symmetric matrix having
the same number of rows and columns as the number of vertices in the
graph and element (i,j) is d[i], the degree of vertex i if if i==j,
-1 if i!=j and there is an edge between vertices i and j and 0
otherwise.
A normalized version of the Laplacian Matrix is similar: element (i,j)
is 1 if i==j, -1/sqrt(d[i] d[j]) if i!=j and there is an edge between
vertices i and j and 0 otherwise.