MC22 — Permute a sparse matrix given row and column permutations

Version 1.0.0

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MC22 Permute a sparse matrix given row and column permutations

Given a sparse matrix $A = {a_{i j}}_{n \times n}$ and a row permutation matrix $P$ and a column permutation matrix $Q$ , this subroutine performs the permutation $Â = P A Q$ . The nonzero entries of $A$ are stored by rows in a compact form and the user deﬁnes the permutation matrices $P$ and $Q$ by index vectors of length $n$ .