laplacian.m

function L = laplacian(g)
% Get graph Laplacian matrix
%
%   L = laplacian(g)
%
% graph Laplacian matrix is defined by L = D - A, where D is vertex degree
% diagonal matrix and A is adjacency matrix.
%
% See also: adjacency
%
% Systems Biology and Evolution Toolbox (SBEToolbox).
% Authors: James Cai, Kranti Konganti.
% (C) Texas A&M University.
%
% $LastChangedDate: 2012-12-28 19:01:43 -0600 (Fri, 28 Dec 2012) $
% $LastChangedRevision: 278 $
% $LastChangedBy: konganti $
%

L = diag(sum(g.adj)) - g.adj;