Large Spare matrix inversion
20 views (last 30 days)
Show older comments
Hello I m doing a project in FEM, I want to increase the speed of my matlab code. I changed full matrix to sparse which reduced the memory but inverse of such big matrix (65000x65000) is taking time. I have tried gmres, iscstab, inv, backslash? This wasnt effective. Please suggest a method or function or toolbox which will increase the speed of matrix inversion?
1 Comment
Christine Tobler
on 20 Jan 2020
Do you mean matrix inversion, or solving a linear system? The inverse of a sparse matrix is typically nearly dense, so the inverse of your 65000x65000 matrix would not fit in memory.
If you are solving a linear system A*x = b, backslash is a good start. The iterative solvers can be more effective, although it's likely that you will need to find a good preconditioner for your system matrix (maybe a simplified version of your FEM problem could work?).
Answers (0)
See Also
Categories
Find more on Operating on Diagonal Matrices in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!