- laplacian_matrix(G, nodelist=None, weight='weight')¶
Return the Laplacian matrix of G.
The graph Laplacian is the matrix L = D - A, where A is the adjacency matrix and D is the diagonal matrix of node degrees.
G : graph
A NetworkX graph
nodelist : list, optional
The rows and columns are ordered according to the nodes in nodelist. If nodelist is None, then the ordering is produced by G.nodes().
weight : string or None, optional (default=’weight’)
The edge data key used to compute each value in the matrix. If None, then each edge has weight 1.
L : SciPy sparse matrix
The Laplacian matrix of G.
For MultiGraph/MultiDiGraph, the edges weights are summed.