Support MatIS and BDDC#4405

Merged

pbrubeck merged 83 commits intomainfrom

Nov 4, 2025

Commits on Sep 8, 2025

Support mat_type="is"
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MatIS: support DirichletBC, add a test
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MatIS: Fix parallel LGMap
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MatNest + MatIS
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More comprehensive tests
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Propagate sub_mat_type, fix MatNest + MatIS
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Only set sub_mat_type on the diagonal blocks
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style
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Test BDDC, setCoordinates
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Fix VectorFunctionSpace
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refine BDDC customization

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fix lint

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Simplify coordinates handling of bddcpc driver

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Don't know why this fixes the mapping for me

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test tabulate_exterior_derivative
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add failing test

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Fix vertex dofs
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Add permutation test
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Trivial case for get_restriction_indices
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DROP BEFORE MERGE
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mark parellel test
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bddc: use callables for gradient and divergence

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minor

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tabulate_exterior_derivative as MatIS
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Fix tabulate_exterior_derivative in parallel
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BDDC get_divergence_mat
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Fix high-order divergence tabulation
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Cleanup
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cleanup
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Fix Q1
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Test tabulate_exterior_derivative
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H(curl) constraints for BDDC
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cleanup
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Refactor
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FDMPC: Support other variants
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bddc: allow view of preconditioning matrix

stefanozampini
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bddc: attach constants of the H(grad) space to discrete gradient

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ImplicitMatrixContext: allow for an arbitrary submatrix extraction

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bddc nedelec: attach constants as nullspace

stefanozampini
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Update .github/workflows/core.yml
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Remove unrelated test
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merge conflict
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