function C = adj2inc ( A )
%ADJ2INC  converts adjacency matrix to incidence matrix

no_vertices = size(A,1);
no_edges = length(find(A));

edge_count = 1;
C=zeros(no_vertices,no_edges)

for i = 1:no_vertices
    for j = 1:no_vertices
        if A(i,j)
            C(i,edge_count) = -1;
            C(j,edge_count) = 1;
            edge_count = edge_count + 1;
        end
    end
end