VecSetValue#

Set a single entry into a PETSc vector, Vec.

Synopsis#

static inline PetscErrorCode VecSetValue(Vec v, PetscInt i, PetscScalar va, InsertMode mode)

Not Collective

Input Parameters#

  • v - the vector

  • row - the row location of the entry

  • value - the value to insert

  • mode - either INSERT_VALUES or ADD_VALUES

Notes#

For efficiency one should use VecSetValues() and set several or many values simultaneously if possible.

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

VecSetValue() uses 0-based indices in Python, C, and Fortran

See Also#

Vectors and Parallel Data, VecSetValues(), VecAssemblyBegin(), VecAssemblyEnd(), VecSetValuesBlockedLocal(), VecSetValueLocal()

Level#

beginner

Location#

include/petscvec.h

Examples#

src/vec/vec/tutorials/ex1.c
src/ksp/ksp/tutorials/ex43.c
src/tao/constrained/tutorials/ex1.c
src/ts/tutorials/extchem.c
src/snes/tutorials/ex56.c
src/ksp/ksp/tutorials/ex56.c
src/ts/tutorials/extchemfield.c
src/ksp/ksp/tutorials/ex49.c
src/snes/tutorials/ex70.c
src/tao/unconstrained/tutorials/eptorsion3.c


Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages