function [sys,x0,str,ts] = weisui1(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     = -1;  % dynamically sized
sizes.NumInputs      = -1;  % dynamically sized
sizes.DirFeedthrough = 1;   % has direct feedthrough
sizes.NumSampleTimes = 1;

sys = simsizes(sizes);
str = [];
x0  = [];
ts  = [-1 0];   % inherited sample time

% end mdlInitializeSizes

function sys = mdlOutputs(t,x,u)

sys = ceil(rand(1)*32);

% end mdlOutputs