MatSNESMFWPSetComputeNormA

Sets whether it computes the ||a|| used by the WP PETSc routine for computing h. With GMRES since the ||a|| is always one, you can save communication by setting this to false.

Synopsis

#include "petscsnes.h"   
int MatSNESMFWPSetComputeNormA(Mat A,PetscTruth flag)

Input Parameters

A - the matrix created with MatCreateSNESMF()
flag - PETSC_TRUE causes it to compute ||a||, PETSC_FALSE assumes it is 1.

Notes

See the manual page for MatCreateSNESMF() for a complete description of the algorithm used to compute h.

See Also

MatSNESMFSetFunctionError(), MatCreateSNESMF()

Level:advanced
Location:
src/snes/mf/wp.c
Index of all SNESMF routines
Table of Contents for all manual pages
Index of all manual pages