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Eigen
5.0.1
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#include <Eigen/src/MetisSupport/MetisSupport.h>
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 Ap is the matperm(i) row (column) of A. WARNING: As computed by METIS, this corresponds to the vector perm (instead of iperm)