VecGetArray2d

Returns a pointer to a 2d contiguous array that contains this processor's portion of the vector data. You MUST call VecRestoreArray2d() when you no longer need access to the array.

Synopsis

#include "petscvec.h" 
int VecGetArray2d(Vec x,int m,int n,int mstart,int nstart,PetscScalar **a[])
Not 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 DACreateLocalVector() mstart and nstart are likely obtained from the corner indices obtained from DAGetGhostCorners() while for DACreateGlobalVector() they are the corner indices from DAGetCorners(). In both cases the arguments from DAGet[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.

See Also

VecGetArray(), VecRestoreArray(), VecGetArrays(), VecGetArrayF90(), VecPlaceArray(),
VecRestoreArray2d(), DAVecGetarray(), DAVecRestoreArray(), VecGetArray3d(), VecRestoreArray3d(), VecGetarray1d(), VecRestoreArray1d(), VecGetArray4d(), VecRestoreArray4d()

Level:beginner
Location:
src/vec/interface/vector.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages