How to quickly update the inverse for a sparse matrix when a row changes?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Dear All,
I have a square very sparse matrix A with a dimension 4000 by 4000, and I have its inverse InvA. Now a row in A changes which is called matrix A1, how can I quickly obtain the inverse of A1 making use of InvA?
Thanks a lot.
Benson
0 Kommentare
Antworten (1)
Steven Lord
am 28 Okt. 2020
You can't even be confident that A1 is invertible.
A = speye(5)
invA = inv(A)
A1 = A;
A1(3, 3) = 0 % changing one element
What is the inverse of A1?
0 Kommentare
Siehe auch
Kategorien
Mehr zu Linear Algebra finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!