Permuting Sparse matrices using "dissect" to Implement "Multilevel Schur complement Low-Rank" (MSLR) method to solve linear systems

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Arash Rezaei el 5 de Nov. de 2022

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https://la.mathworks.com/matlabcentral/answers/1844103-permuting-sparse-matrices-using-dissect-to-implement-multilevel-schur-complement-low-rank-mslr

I want to implement "parGeMSLR" method in matlab. [see: https://www-users.cse.umn.edu/~saad/software/ParGeMSLR/Documentation.pdf]

This need permuting sparse matrix using nested dissection. MATLAB has "dissect" function which ouput is only a permute vector. I need to have seperators and other informations.

How can I extract the requiered informations from the output of "dissect"? or is there any simple instructure to implement nested dissection? or is there any ready to use package available?

Thanks