MatSchurComplementUpdateSubMatrices#

Updates the Schur complement matrix object with new submatrices

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatSchurComplementUpdateSubMatrices(Mat S, Mat A00, Mat Ap00, Mat A01, Mat A10, Mat A11)

Collective

Input Parameters#

  • S - matrix obtained with MatCreateSchurComplement() (or MatSchurSetSubMatrices()) and implementing the action of A11 - A10 ksp(A00,Ap00) A01

  • A00 - the upper-left block of the original matrix A = [A00 A01; A10 A11]

  • Ap00 - preconditioning matrix for use in ksp(A00,Ap00) to approximate the action of A00^{-1}

  • A01 - the upper-right block of the original matrix A = [A00 A01; A10 A11]

  • A10 - the lower-left block of the original matrix A = [A00 A01; A10 A11]

  • A11 - (optional) the lower-right block of the original matrix A = [A00 A01; A10 A11]

Notes#

All four matrices must have the same MPI communicator

A00 and A11 must be square matrices

All of the matrices provided must have the same sizes as was used with MatCreateSchurComplement() or MatSchurComplementSetSubMatrices() though they need not be the same matrices.

This can only be called after MatCreateSchurComplement() or MatSchurComplementSetSubMatrices(), it cannot be called immediately after MatSetType(S,MATSCHURCOMPLEMENT);

Developer Notes#

This code is almost identical to MatSchurComplementSetSubMatrices(). The API should be refactored.

See Also#

KSP: Linear System Solvers, Mat, MatCreateNormal(), MatMult(), MatCreate(), MatSchurComplementGetKSP(), MatCreateSchurComplement()

Level#

intermediate

Location#

src/ksp/ksp/utils/schurm/schurm.c

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