libccolamd2 - 1:5.12.0+dfsg-2 main

Suitesparse is a collection of libraries for computations involving
sparse matrices.
.
The CCOLAMD library implements the "Constrained COLumn Approximate Minimum
Degree ordering" algorithm. It computes a permutation vector P such that the
LU factorization of A (:,P) tends to be sparser than that of A. The Cholesky
factorization of (A (:,P))'*(A (:,P)) will also tend to be sparser than that
of A'*A.