function?[sysxOstrts]=singlerubostsliding（txuflag）
case?O
????[sysxOstrts]=mdlInitializeSizes;
case?3
????sys=mdlOutputs（txu）;?
case?{249}
????sys=[];??
otherwise
????error（[‘Unhandled?flag=‘num2tr（flag）]）;?
end

function?[sysxOstrts]=mdlInitializeSizes
sizes=simsizes;?
sizes.NumContStates?=0;?
sizes.NurnDiscStates?=?0;?
sizes.NumOutputs?=1;
stzes.NumInputs?=?3