You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spm_vb_adjacency.m
    path of file: ./repos/spm
    
    the code of the file until where you have to start completion: function W = spm_vb_adjacency(edges,weights,N)
% (Weighted) adjacency (or weight) matrix of a graph
% FORMAT W = spm_vb_adjacency(edges,weights,N)
%
% edges    [Nedges x 2] list of neighboring voxel indices

    
function W = spm_vb_adjacency(edges,weights,N)
% (Weighted) adjacency (or weight) matrix of a graph
% FORMAT W = spm_vb_adjacency(edges,weights,N)
%
% edges    [Nedges x 2] list of neighboring voxel indices
% weights  [Nedges x 1] list of edge weights (unity of not specified)
% N        number of nodes (cardinality of node set)
%
% W        [N x N] matrix of (weighted) edges
% Wij      edge weight between nodes i and j if they are neighbors, otherwise 0
%__________________________________________________________________________
 
% Lee Harrison
% Copyright (C) 2005-2022 Wellcome Centre for Human Neuroimaging


% Number of edges
Ne = size(edges,1);

% Uniform weights if not specified
if nargin < 2
    weights = ones(Ne,1);
end