VecSetValue

Set a single entry into a vector.

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 Fortran as well as in C.

See Also

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

Level

beginner

Location

include/petscvec.h

Examples

src/mat/tutorials/ex3.c
src/ksp/ksp/tutorials/ex56.c
src/tao/constrained/tutorials/ex1.c
src/ksp/ksp/tutorials/ex43.c
src/ksp/ksp/tutorials/ex49.c
src/snes/tutorials/ex56.c
src/snes/tutorials/ex28.c
src/snes/tutorials/ex30.c
src/snes/tutorials/ex70.c
src/tao/unconstrained/tutorials/eptorsion3.c

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