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#

  • 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 - Insure that U + h*a is nonnegative

Note#

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

See Also#

Matrices, Mat, MATMFFD, MatMFFDSetCheckh()

Level#

advanced

Location#

src/mat/impls/mffd/mffd.c

Index of all Mat routines
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Index of all manual pages