VecSetValuesLocal#

Inserts or adds values into certain locations of a vector, using a local ordering of the nodes.

Synopsis#

#include "petscvec.h"   
PetscErrorCode VecSetValuesLocal(Vec x, PetscInt ni, const PetscInt ix[], const PetscScalar y[], InsertMode iora)

Not Collective

x - vector to insert in
ni - number of elements to add
ix - indices where to add
y - array of values
iora - either INSERT_VALUES replaces existing entries with new values, ADD_VALUES adds values to any existing entries

VecSetValuesLocal() sets x[ix[i]] = y[i], for i=0,…,ni-1.

Calls to VecSetValuesLocal() with the INSERT_VALUES and ADD_VALUES options cannot be mixed without intervening calls to the assembly routines.

These values may be cached, so VecAssemblyBegin() and VecAssemblyEnd() MUST be called after all calls to VecSetValuesLocal() have been completed.

VecSetValuesLocal() uses 0-based indices in Fortran as well as in C.

If any of ix and y are scalars pass them using, for example,

  VecSetValuesLocal(mat, one, [ix], [y], INSERT_VALUES)

intermediate