MATLAB: How to convert sparse matrix to adjacency matrix

MATLABmatricesmatrixmatrix array

How do you convert sparse matrix to adjacency matrix in Matlab 2015?

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This submission on the MATLAB File Exchange says that it will convert a *.gml file to an adjacency matrix. Maybe it will work for you.

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MATLAB: Plotting data from GML files

fileName = 'dolphins.gml';
inputfile = fopen(fileName);
l=0;
k=1;
A = zeros([],2) ;
while 1
    % Get a line from the input file
    tline = fgetl(inputfile);
    % Quit if end of file
    if ~ischar(tline)
        break
    end
    nums = regexp(tline,'\d+','match');
    if ~isempty(nums)
        if l==1
            l=0;
            A(k,2)=str2double(nums{1});
            k=k+1;
            continue;
        end
        A(k,1)=str2double(nums{1});
        l=1;
    else
        l=0;
        continue;
    end
end
fclose(inputfile) ;
G = zeros([],[]) ;
for i=1:length(A)
    G(A(i,1)+1,A(i,2)+1) = 1;
    G(A(i,2)+1,A(i,1)+1) = 1;
end
figure
g = graph(G) ;
plot(g)
figure
L=diag(sum(G))-G;
[v,~]=eig(L);
xy=v(:,[2 3]) ;
gplot(G,xy,'.-r')

MATLAB: Convert edge list to adjacency matrix

If you want a sparse adjacency matrix, call SPARSE.

 edgeList = [1 2; 2 3; 2 4];
 adj = sparse(edgeList(:, 1), edgeList(:, 2), 1, 4, 4);

Note that if you have a repeated edge in your edgeList, the corresponding element of adj will be greater than 1.

If you want a full adjacency matrix, either convert the sparse adjacency matrix to FULL or call ACCUMARRAY.

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Related Solutions

MATLAB: Plotting data from GML files

MATLAB: Convert edge list to adjacency matrix

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