MatSchurComplementComputeExplicitOperator

Compute the Schur complement matrix explicitly

Synopsis

#include "petscksp.h" 
PetscErrorCode MatSchurComplementComputeExplicitOperator(Mat A, Mat *S)

Collective

Input Parameter

• A - the matrix obtained with MatCreateSchurComplement()

Output Parameter

• S - the Schur complement matrix

Notes

This can be expensive, so it is mainly for testing

Use MatSchurComplementGetPmat() to get a sparse approximation for the Schur complement suitable for use in building a preconditioner

See Also

KSP: Linear System Solvers, MatCreateSchurComplement(), MatSchurComplementUpdateSubMatrices(), MatSchurComplementGetPmat()

Level

advanced

Location

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

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