2774     IS              isx, isv, istmp;  in SetProblem()  local
2784     PetscCall(ISCreateBlock(PETSC_COMM_WORLD, dim, Np, idx, PETSC_COPY_VALUES, &isx));  in SetProblem()
2792     PetscCall(TSRHSSplitSetIS(ts, "position", isx));  in SetProblem()
2794     PetscCall(ISDestroy(&isx));  in SetProblem()
2872   IS       isx, isv;  in InitializeSolveAndSwarm()  local
2894   PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in InitializeSolveAndSwarm()
2898   PetscCall(VecISCopy(u, isx, SCATTER_FORWARD, gc));  in InitializeSolveAndSwarm()
2925     IS         isx, isv;  in MigrateParticles()  local
2929     PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in MigrateParticles()
2931     PetscCall(VecGetSubVector(u, isx, &position));  in MigrateParticles()
2937     PetscCall(VecISCopy(u, isx, SCATTER_REVERSE, gc));  in MigrateParticles()
2970     PetscCall(VecRestoreSubVector(u, isx, &position));  in MigrateParticles()