# Specify a block preconditioner? KSPSetOperators(KSP ksp, Mat Amat, Mat Pmat)

**URL:** <https://community.freefem.org/t/specify-a-block-preconditioner-kspsetoperators-ksp-ksp-mat-amat-mat-pmat/2567>\
**Category:** General Discussion\
**Created:** [June 29, 2023, 9:17am UTC](https://community.freefem.org/t/specify-a-block-preconditioner-kspsetoperators-ksp-ksp-mat-amat-mat-pmat/2567 "2023-06-29T09:17:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [June 30, 2023, 5:21am UTC](https://community.freefem.org/t/specify-a-block-preconditioner-kspsetoperators-ksp-ksp-mat-amat-mat-pmat/2567/2 "2023-06-30T05:21:00Z")

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See [Applying a modified preconditioner matrix in PETSc - #2 by prj](https://community.freefem.org/t/applying-a-modified-preconditioner-matrix-in-petsc/1142/2).

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