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Suitesparse-btf
Jul 20, 2023
Permutation to block triangular form
This port installs the module BTF of SuiteSparse.
BTF is a software package for permuting a matrix into block upper triangular form. It includes a maximum transversal algorithm, which finds a permutation of a square or rectangular matrix so that it has a zero-free diagonal if one exists; otherwise, it finds a maximal matching which maximizes the number of nonzeros on the diagonal. The package also includes a method for finding the strongly connected components of a graph. These two methods together give the permutation to block upper triangular form.
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