ME22 — Permute a sparse matrix given row and column permutations

Version 1.0.0

User documentation

Fortran

Single
Double

ME22 Permute a sparse matrix given row and column permutations

Given a sparse complex 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 non-zero elements 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 $n$ .