Re: [petsc-users] Convert a 3D DMDA sub-vector to a natural 2D vector

Several years ago I asked a similar question and this is what Barry told me: >> Randy, Take a look at DMDAGetRay() in src/dm/impls/da/dasub.c (now called DMDACreateRay()) this takes a row or column from a 2d DADM. You can use the same kind of approach to get a slice from a 3d

[petsc-users] Convert a 3D DMDA sub-vector to a natural 2D vector

Hi PETSc-developers, For an application, I'd like to extract a 2D slice from a 3D DMDA vector, perform a `MatMult` on it (a discretized rotation on the 2D vector) and place the resulting vector back into the 3D vector. The approach I'd taken was to use `DMDACreatePatchIS` to create an IS that