Orxan Shibliyev <[email protected]> writes: > I used KSP to solve Ax=b successfully but I would like to solve Ax=b only > for certain rows. How can I do this?
It's not actually significantly cheaper no matter what you do. You can save a little on non-leading constant factors for some methods (basically permuting the factorization so you only need a partial back-solve). This is usually negligible.
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