VecSet#

Sets all components of a vector to a single scalar value.

Synopsis#

#include "petscvec.h"   
PetscErrorCode VecSet(Vec x, PetscScalar alpha)

Logically Collective

Input Parameters#

  • x - the vector

  • alpha - the scalar

Notes#

For a vector of dimension n, VecSet() sets x[i] = alpha, for i=1,…,n, so that all vector entries then equal the identical scalar value, alpha. Use the more general routine VecSetValues() to set different vector entries.

You CANNOT call this after you have called VecSetValues() but before you call VecAssemblyBegin()

If alpha is zero and the norm of the vector is known to be zero then this skips the unneeded zeroing process

See Also#

Vectors and Parallel Data, Vec, VecSetValues(), VecSetValuesBlocked(), VecSetRandom()

Level#

beginner

Location#

src/vec/vec/interface/rvector.c

Examples#

src/ts/tutorials/ex20td.c
src/vec/vec/tutorials/ex18.c
src/vec/vec/tutorials/performance.c
src/vec/vec/tutorials/ex15.c
src/vec/vec/tutorials/ex8.c
src/vec/vec/tutorials/ex2.c
src/vec/vec/tutorials/ex11.c
src/vec/vec/tutorials/ex1.c
src/vec/vec/tutorials/ex13.c
src/vec/vec/tutorials/ex12.c

Implementations#

VecSet_Nest() in src/vec/vec/impls/nest/vecnest.c
VecSet_Seq() in src/vec/vec/impls/seq/dvec2.c
VecSet_SeqKokkos() in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecSet_SeqViennaCL() in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx


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