Change interface of fem.petsc.create_vector to allow for general list of function spaces
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schnellerhase
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garth-wells
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Apr 9, 2025
schnellerhase
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la.petsc.create_vector to allow for general list of function spacesfem.petsc.create_vector to allow for general list of function spaces
francesco-ballarin
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Jul 13, 2025
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The creation of PETSc vectors relies internally on a list of tuples
(IndexMap, bs). Given a list of such and a vector kind we can create the corresponding coefficient vector. Previously this functionality was not exposed to the user directly and only supported indirectly by passing aFormfrom which the spaces would then be extracted.la.petsc.create_vectorwhich now takes a list of(IndexMap, bs)tuples and returns aPETSc.Vecobject. The interface offem.petsc.create_vectoris extended to allow for function spaces as input as well. Vectors can therefore now be create by a list of function spaces:b = dolfinx.fem.create_vector([V, W])and no longer require a form to be present for such construction. And alternatively from a general sequence of index maps and blocks sizes, without the presence of any function spaces withla.petsc.create_vector._assign_block_datawhich factors out the attachment of block information to PETSc vectors.