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Eigen
3.4.90 (git rev 5a9f66fb35d03a4da9ef8976e67a61b30aa16dcf)
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Get the fill-reducing ordering from the METIS package
If A is the original matrix and Ap is the permuted matrix, the fill-reducing permutation is defined as follows : Row (column) i of A is the matperm(i) row (column) of Ap. WARNING: As computed by METIS, this corresponds to the vector iperm (instead of perm)