Nonlinear solver generalizations - #4537

Merged

lindsayad merged 13 commits into

libMesh:develfrom

lindsayad:more-shell-matrix-support

Sep 24, 2026

Commits on Sep 1, 2026

Make PetscMatrixShellMatrix instantiable
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3dffbf5
Fix PetscMFFDMatrix Mat assignment

lindsayad
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claude
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50994df
Add two-matrix arg solve overload to NonlinearSolver

lindsayad
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claude
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bb24853

Commits on Sep 2, 2026

Add unit tests

lindsayad
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claude
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e1fa43f
Run bootstrap
lindsayad
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b3a1a3c
Use libmesh petsc shims

lindsayad
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claude
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8fe8480
Guard nonlinear implicit system test with necessary nonlinear solver package

lindsayad
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claude
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d8ad017

Commits on Sep 8, 2026

Explicitly allow calling zero() on shells

lindsayad
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claude
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762f528
More informative error message in PetscMatrixShellMatrix methods
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740f68b
Add back PetscMFFDMatrix::operator=
lindsayad
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a8efa5f

Commits on Sep 17, 2026

Make sure to clear in assign if we already own a mat

lindsayad
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claude
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80e1f72
Keep operator= definition outside of the class definition
lindsayad
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b61f1a7
See about adding the discussion blurb John requested
lindsayad
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01c924a