function [sys,x0,str,ts]=mod8(t,x,u,flag)
switch flag,
case 0,
    [sys,x0,str,ts]=mdlInitializeSizes;
case 3,
    sys=mdlOutputs(t,x,u);
case{1,2,4,9}
    sys=[];
otherwise
    error(['Unhandled flag =',num2str(flag)]);
end
function [sys,x0,str,ts]=mdlInitializeSizes
sizes=simsizes;
sizes.NumContStates=0;
sizes.NumDiscStates=0;
sizes.NumOutputs=4;
sizes.NumInputs=4;
sizes.DirFeedthrough=1;
sizes.NumSampleTimes=1;
sys=simsizes(sizes);
x0=[];
str=[];
ts=[0,0];
function sys=mdlOutputs(t,x,u)
sys=[u(1)*(u(1)>=0)+(8+u(1))*(u(1)<0),u(2)*(u(2)>=0)+(8+u(2))*(u(2)<0),u(3)*(u(3)>=0)+(8+u(3))*(u(3)<0),u(4)*(u(4)>=0)+(8+u(4))*(u(4)<0)];
end