petsc-master 2020-09-24
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Returns a pointer to a 1d contiguous array that contains this processor's portion of the vector data. You MUST call VecRestoreArray1dRead() when you no longer need access to the array.


#include "petscvec.h"   
PetscErrorCode  VecGetArray1dRead(Vec x,PetscInt m,PetscInt mstart,PetscScalar *a[])
Logically Collective

Input Parameter

x - the vector
m - first dimension of two dimensional array
mstart - first index you will use in first coordinate direction (often 0)

Output Parameter

a - location to put pointer to the array


For a vector obtained from DMCreateLocalVector() mstart are likely obtained from the corner indices obtained from DMDAGetGhostCorners() while for DMCreateGlobalVector() they are the corner indices from DMDAGetCorners().

For standard PETSc vectors this is an inexpensive call; it does not copy the vector values.

See Also

VecGetArray(), VecRestoreArray(), VecGetArrays(), VecGetArrayF90(), VecPlaceArray(),
VecRestoreArray2d(), DMDAVecGetArray(), DMDAVecRestoreArray(), VecGetArray3d(), VecRestoreArray3d(), VecGetArray2d(), VecRestoreArray1d(), VecGetArray4d(), VecRestoreArray4d()




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