284 …Vec          Xslow, Xfast; /* subvectors of X which store slow components and fast components resp…  in TSEvaluateStep_RK_MultirateSplit()  local
298     PetscCall(VecGetSubVector(X, rk->is_fast, &Xfast));  in TSEvaluateStep_RK_MultirateSplit()
299     PetscCall(VecMAXPY(Xfast, s, w, rk->YdotRHS_fast));  in TSEvaluateStep_RK_MultirateSplit()
300     PetscCall(VecRestoreSubVector(X, rk->is_fast, &Xfast));  in TSEvaluateStep_RK_MultirateSplit()
313   Vec              Yfast, Xfast;  in TSStepRefine_RK_MultirateSplit()  local
322     PetscCall(VecGetSubVector(ts->vec_sol, rk->is_fast, &Xfast));  in TSStepRefine_RK_MultirateSplit()
338       PetscCall(VecCopy(Xfast, Yfast));  in TSStepRefine_RK_MultirateSplit()
345     PetscCall(VecRestoreSubVector(ts->vec_sol, rk->is_fast, &Xfast));  in TSStepRefine_RK_MultirateSplit()
357     PetscCall(VecGetSubVector(ts->vec_sol, rk->is_fast, &Xfast));  in TSStepRefine_RK_MultirateSplit()
358     PetscCall(VecISCopy(rk->X0, rk->is_fast, SCATTER_FORWARD, Xfast));  in TSStepRefine_RK_MultirateSplit()
359     PetscCall(VecRestoreSubVector(ts->vec_sol, rk->is_fast, &Xfast));  in TSStepRefine_RK_MultirateSplit()