en Copyright 2025 Java http://opengrok.phasta.colorado.edu:8080/source/history/petsc/src/ksp/pc/impls/mat/tests/makefile#93d6cec853fb8d778548f47f83264766552744e5 Merge branch 'tisaac/feature-mat-vectordiagonal' into 'main'Add MATDIAGONAL and PCMatSetApplyOperation()See merge request petsc/petsc!6487 List of files: /petsc/src/ksp/pc/impls/mat/tests/makefile Tue, 30 May 2023 03:28:13 +0000 Satish Balay <balay@mcs.anl.gov> http://opengrok.phasta.colorado.edu:8080/source/history/petsc/src/ksp/pc/impls/mat/tests/makefile#345a4b08d02b12c6b890b4696d3c0881dab2c40c Add `MATDIAGONAL` and `PCMatSetApplyOperation()``MATDIAGONAL` (`MatCreateDiagonal()`) is an interface formanipulating a diagonal matrix as a `Vec`, in particular supportingno-copy modification of the diagonal and inverse diagonal via`MatDiagonalGetDiagonal()`, `MatDiagonalRestoreDiagonal()`,`MatDiagonalGetInverseDiagonal()`, and`MatDiagonalRestoreInverseDiagonal`().`PCMatSetApplyOperation()` and `PCMatGetApplyOperation()`support using all the linear operators currently defined by a `Mat`(`MatMult()`, `MatMultTranspose()`, `MatMultHermitianTranspose()`,`MatSolve()`, `MatSolveTranspose()`) as the operation of `PCApply()`for a `PCMAT`. The advantage over a `PCSHELL` is that the otheroperations (`PCApplyTranspose()`, `PCMatApply()`) are automaticallyinferred.These tools help make it easier to route operations like`VecPointwiseMult()` and `VecPointwiseDivide()` through`KSPSolve()` to avoid handling diagonal matrices as a specialcase (a pattern that is going to be removed from `MATLMVM`). List of files: /petsc/src/ksp/pc/impls/mat/tests/makefile Fri, 19 May 2023 16:10:28 +0000 Toby Isaac <toby.isaac@gmail.com>