petsc-dev 2014-04-23
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VecSetOption

Sets an option for controling a vector's behavior.

Synopsis

#include "petscvec.h"   
PetscErrorCode  VecSetOption(Vec x,VecOption op,PetscBool flag)
Collective on Vec

Input Parameter

x - the vector
op - the option
flag - turn the option on or off

Supported Options

Level:intermediate
Location:
src/vec/vec/interface/vector.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages

VEC_IGNORE_OFF_PROC_ENTRIES, which causes VecSetValues() to ignore- entries destined to be stored on a separate processor. This can be used to eliminate the global reduction in the VecAssemblyXXXX() if you know that you have only used VecSetValues() to set local elements
VEC_IGNORE_NEGATIVE_INDICES, which means you can pass negative indices- in ix in calls to VecSetValues() or VecGetValues(). These rows are simply ignored.