petsc-3.14.6 2021-03-30
VecGetArray2dWrite
Returns a pointer to a 2d contiguous array that will contain this processor's portion of the vector data. You MUST call VecRestoreArray2dWrite() when you no longer need access to the array.
Synopsis
#include "petscvec.h"
PetscErrorCode VecGetArray2dWrite(Vec x,PetscInt m,PetscInt n,PetscInt mstart,PetscInt nstart,PetscScalar **a[])
Logically Collective
Input Parameter
| x | - the vector
|
| m | - first dimension of two dimensional array
|
| n | - second dimension of two dimensional array
|
| mstart | - first index you will use in first coordinate direction (often 0)
|
| nstart | - first index in the second coordinate direction (often 0)
|
Output Parameter
| a | - location to put pointer to the array
|
Notes
For a vector obtained from DMCreateLocalVector() mstart and nstart are likely
obtained from the corner indices obtained from DMDAGetGhostCorners() while for
DMCreateGlobalVector() they are the corner indices from DMDAGetCorners(). In both cases
the arguments from DMDAGet[Ghost]Corners() are reversed in the call to VecGetArray2d().
For standard PETSc vectors this is an inexpensive call; it does not copy the vector values.
Concepts: vector^accessing local values as 2d array
See Also
VecGetArray(), VecRestoreArray(), VecGetArrays(), VecGetArrayF90(), VecPlaceArray(),
VecRestoreArray2d(), DMDAVecGetArray(), DMDAVecRestoreArray(), VecGetArray3d(), VecRestoreArray3d(),
VecGetArray1d(), VecRestoreArray1d(), VecGetArray4d(), VecRestoreArray4d()
Level
developer
Location
src/vec/vec/interface/rvector.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages