MatMFFDWPSetComputeNormU#
Sets whether it computes the ||U|| used by the Walker-Pernice [PW98] 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
MATMFFDmatrixflag -
PETSC_TRUEcauses it to compute \(||U||\),PETSC_FALSEuses 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.
Note#
See the manual page for MATMFFD_WP for a complete description of the
algorithm used to compute h.
References#
- PW98
M. Pernice and H. F. Walker. NITSOL: a Newton iterative solver for nonlinear systems. SIAM J. Sci. Stat. Comput., 19:302–318, 1998.
See Also#
MATMFFD_WP, MATMFFD, MatMFFDSetFunctionError(), MatCreateSNESMF()
Level#
advanced
Location#
Implementations#
MatMFFDWPSetComputeNormU_P() in src/mat/impls/mffd/wp.c
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Index of all manual pages