petsc-3.3-p7 2013-05-11

MatMFFDCheckPositivity

 Checks that all entries in U + h*a are positive or zero, decreases h until this is satisfied.

Synopsis

#include "petscmat.h"   
PetscErrorCode  MatMFFDCheckPositivity(void* dummy,Vec U,Vec a,PetscScalar *h)
Logically Collective on Vec

Input Parameters

U - base vector that is added to
a - vector that is added
h - scaling factor on a
dummy - context variable (unused)

Options Database Keys

-mat_mffd_check_positivity -

Notes: This is rarely used directly, rather it is passed as an argument to MatMFFDSetCheckh()

See Also

MatMFFDSetCheckh()

Level:advanced
Location:src/mat/impls/mffd/mffd.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages