|Code Listing by Pawel Kowal|
finds null space and range of a sparse matrix using lu decomposition.
This routine is devoted to find null space of possibly large matrix fast.
Results may be inaccurate if zero and nonzero singular values are not well separated.
rrlu computes a rank revealing LU factorization of a general m-by-n real full matrix A using partial pivoting with row and column interchanges.
The factorization has the form
A(P,Q) = L * U
where P and Q are permutation...
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