1445     IS              isx, isv, istmp;  in SetProblem()  local
1455     PetscCall(ISCreateBlock(PETSC_COMM_WORLD, dim, Np, idx, PETSC_COPY_VALUES, &isx));  in SetProblem()
1463     PetscCall(TSRHSSplitSetIS(ts, "position", isx));  in SetProblem()
1465     PetscCall(ISDestroy(&isx));  in SetProblem()
1543   IS       isx, isv;  in InitializeSolveAndSwarm()  local
1558   PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in InitializeSolveAndSwarm()
1562   PetscCall(VecISCopy(u, isx, SCATTER_FORWARD, gc));  in InitializeSolveAndSwarm()
1589     IS         isx, isv;  in MigrateParticles()  local
1593     PetscCall(TSRHSSplitGetIS(ts, "position", &isx));  in MigrateParticles()
1595     PetscCall(VecGetSubVector(u, isx, &position));  in MigrateParticles()
1601     PetscCall(VecISCopy(u, isx, SCATTER_REVERSE, gc));  in MigrateParticles()
1633     PetscCall(VecRestoreSubVector(u, isx, &position));  in MigrateParticles()