petsc-3.9.4 2018-09-11

MatMFFDWPSetComputeNormU

Sets whether it computes the ||U|| used by the WP PETSc routine for computing h. With any Krylov solver this need only be computed during the first iteration and kept for later.

Synopsis

#include "petscmat.h"   
PetscErrorCode  MatMFFDWPSetComputeNormU(Mat A,PetscBool flag)

Input Parameters

	A	- the matrix created with MatCreateSNESMF()
	flag	- PETSC_TRUE causes it to compute \|\|U\|\|, PETSC_FALSE uses the previous value

Options Database Key

-mat_mffd_compute_normu <true,false> -true by default, false can save calculations but you must be sure that ||U|| has not changed in the mean time.

Notes

See the manual page for MATMFFD_WP for a complete description of the algorithm used to compute h.

Level

advanced

Location

src/mat/impls/mffd/wp.c

Implementations

MatMFFDWPSetComputeNormU_P in src/mat/impls/mffd/wp.c

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Index of all manual pages