petsc-3.7.1 2016-05-15
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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 Many br

Input Parameters

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

Options Database Keys

-mat_mffd_check_positivity - Many br Many br

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

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