MatMFFDCheckPositivity#
Checks that all entries in \(U + h*a \) are positive or zero, decreases h until this is satisfied for a MATMFFD matrix
Synopsis#
#include "petscmat.h"
PetscErrorCode MatMFFDCheckPositivity(void *dummy, Vec U, Vec a, PetscScalar *h)
Logically Collective
Input Parameters#
dummy - context variable (unused)
U - base vector that is added to
a - vector that is added
h - scaling factor on
a, may be changed on output
Options Database Keys#
-mat_mffd_check_positivity
- Ensure that \(U + h*a\) is nonnegative
Note#
This is rarely used directly, rather it is passed as an argument to MatMFFDSetCheckh()
See Also#
Level#
advanced
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages