This function identifies equivalence classes within the graph defined by the (sparse) matrix A. Off diagonal matrix elements, Aij, which exceed the value of 'lim' are taken to establish an equivalence relation between the components i and j.
Marcin Konowalczyk (2021). mat2blk (https://www.mathworks.com/matlabcentral/fileexchange/60786-mat2blk), MATLAB Central File Exchange. Retrieved .
Inspired by: block diagonal representation
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