2169     IS              isx, isv, istmp;  in SetProblem()  local
2179     PetscCall(ISCreateBlock(PETSC_COMM_WORLD, dim, Np, idx, PETSC_COPY_VALUES, &isx));  in SetProblem()
2187     PetscCall(TSRHSSplitSetIS(ts, "position", isx));  in SetProblem()
2189     PetscCall(ISDestroy(&isx));  in SetProblem()
2267   IS       isx, isv;  in InitializeSolveAndSwarm()  local
2289   PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in InitializeSolveAndSwarm()
2293   PetscCall(VecISCopy(u, isx, SCATTER_FORWARD, gc));  in InitializeSolveAndSwarm()
2320     IS         isx, isv;  in MigrateParticles()  local
2324     PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in MigrateParticles()
2326     PetscCall(VecGetSubVector(u, isx, &position));  in MigrateParticles()
2332     PetscCall(VecISCopy(u, isx, SCATTER_REVERSE, gc));  in MigrateParticles()
2364     PetscCall(VecRestoreSubVector(u, isx, &position));  in MigrateParticles()