VecGetArray

Returns a pointer to a contiguous array that contains this MPI processes’s portion of the vector data

Synopsis

#include "petscvec.h"   
PetscErrorCode VecGetArray(Vec x, PetscScalar *a[])

Logically Collective

Input Parameter

• x - the vector

Output Parameter

• a - location to put pointer to the array

Notes

For the standard PETSc vectors, VecGetArray() returns a pointer to the local data array and does not use any copies. If the underlying vector data is not stored in a contiguous array this routine will copy the data to a contiguous array and return a pointer to that. You MUST call VecRestoreArray() when you no longer need access to the array.

For vectors that may also have the array data in GPU memory, for example, VECCUDA, this call ensures the CPU array has the most recent array values by copying the data from the GPU memory if needed.

Fortran Note

  PetscScalar, pointer :: a(:)

See Also

Vectors and Parallel Data, Vec, VecRestoreArray(), VecGetArrayRead(), VecGetArrays(), VecPlaceArray(), VecGetArray2d(), VecGetArrayPair(), VecRestoreArrayPair(), VecGetArrayWrite(), VecRestoreArrayWrite(), VecGetArrayAndMemType()

Level

beginner

Location

src/vec/vec/interface/rvector.c

Examples

src/snes/tutorials/ex21.c
src/snes/tutorials/ex1.c
src/snes/tutorials/ex22.c
src/snes/tutorials/ex99.c
src/snes/tutorials/ex7.c
src/snes/tutorials/ex71.c
src/snes/tutorials/ex59.c
src/snes/tutorials/ex5f90.F90
src/snes/tutorials/ex6.c
src/snes/tutorials/ex13.c

Implementations

VecGetArray_Nest() in src/vec/vec/impls/nest/vecnest.c
VecGetArray_SeqKokkos() in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecGetArray_SeqViennaCL() in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx

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