PetscErrorCode DMStagVecGetArray(DM dm,Vec vec,void *array)Logically Collective
This function returns a (dim+1)-dimensional array for a dim-dimensional DMStag.
The first 1-3 dimensions indicate an element in the global numbering, using the standard C ordering.
The final dimension in this array corresponds to a degree of freedom with respect to this element, for example corresponding to the element or one of its neighboring faces, edges, or vertices.
For example, for a 3D DMStag, indexing is array[k][j][i][idx], where k is the index in the z-direction, j is the index in the y-direction, and i is the index in the x-direction.
"idx" is obtained with DMStagGetLocationSlot(), since the correct offset into the (dim+1)-dimensional C array depends on the grid size and the number of dof stored at each location.
| dm | - the DMStag object | |
| vec | - the Vec object |
| array | - the array |