65   IS           is_slow, is_slowbuffer, is_medium, is_mediumbuffer, is_fast;  member
677     for (j = 0; j < i; j++) PetscCall(VecGetSubVector(YdotRHS[j], mprk->is_fast, &YdotRHS_fast[j]));  in TSStep_MPRK()
678     PetscCall(VecGetSubVector(Y[i], mprk->is_fast, &Yfast));  in TSStep_MPRK()
680     PetscCall(VecRestoreSubVector(Y[i], mprk->is_fast, &Yfast));  in TSStep_MPRK()
681 …for (j = 0; j < i; j++) PetscCall(VecRestoreSubVector(YdotRHS[j], mprk->is_fast, &YdotRHS_fast[j])…  in TSStep_MPRK()
780   PetscCall(VecGetSubVector(X, mprk->is_fast, &Xfast));  in TSEvaluateStep_MPRKSPLIT()
782   PetscCall(VecRestoreSubVector(X, mprk->is_fast, &Xfast));  in TSEvaluateStep_MPRKSPLIT()
851     PetscCall(VecGetSubVector(Y[i], mprk->is_fast, &Yfast));  in TSStep_MPRKSPLIT()
853     PetscCall(VecRestoreSubVector(Y[i], mprk->is_fast, &Yfast));  in TSStep_MPRKSPLIT()
998     PetscCall(VecGetSubVector(ts->vec_sol, mprk->is_fast, &YdotRHS_fast));  in TSMPRKTableauSetUp()
1000     PetscCall(VecRestoreSubVector(ts->vec_sol, mprk->is_fast, &YdotRHS_fast));  in TSMPRKTableauSetUp()
1022   PetscCall(TSRHSSplitGetIS(ts, "fast", &mprk->is_fast));  in TSSetUp_MPRK()
1023 …PetscCheck(mprk->is_slow && mprk->is_fast, PetscObjectComm((PetscObject)ts), PETSC_ERR_USER, "Must…  in TSSetUp_MPRK()