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sfuntmpl.m in Matlabsimulationofco

			
function [sys,x0,str,ts] = sfuntmpl(t,x,u,flag)
switch flag,
  %%%%%%%%%%%%%%%%%%
  % Initialization %
  %%%%%%%%%%%%%%%%%%
  case 0,
    [sys,x0,str,ts]=mdlInitializeSizes;

  %%%%%%%%%%%%%%%
  % Derivatives %
  %%%%%%%%%%%%%%%
  case 1,
    sys=mdlDerivatives(t,x,u);

  %%%%%%%%%%
  % Update %
  %%%%%%%%%%
  case 2,
    sys=mdlUpdate(t,x,u);

  %%%%%%%%%%%
  % Outputs %
  %%%%%%%%%%%
  case 3,
    sys=mdlOutputs(t,x,u);

  %%%%%%%%%%%%%%%%%%%%%%%
  % GetTimeOfNextVarHit %
  %%%%%%%%%%%%%%%%%%%%%%%
  case 4,
    sys=mdlGetTimeOfNextVarHit(t,x,u);

  %%%%%%%%%%%%%
  % Terminate %
  %%%%%%%%%%%%%
  case 9,
    sys=mdlTerminate(t,x,u);

  %%%%%%%%%%%%%%%%%%%%
  % Unexpected flags %
  %%%%%%%%%%%%%%%%%%%%
  otherwise
    error(['Unhandled flag = ',num2str(flag)]);

end

% end sfuntmpl

%
%==================================================
% mdlInitializeSizes
% Return the sizes, initial conditions, 
% and sample times for the S-function.
%==================================================
%
function [sys,x0,str,ts]=mdlInitializeSizes

sizes = simsizes;
% 该语句返回一个没有经过初始化的sizes数组，此数组是
% s-function信息的载体。
% 根据s-function的实际情况及sizes数组各个字段的意义可以
% 对各字段进行赋值。
sizes.NumContStates  = 0;
sizes.NumDiscStates  = 0;
sizes.NumOutputs     = 0;
sizes.NumInputs      = 0;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;   
% at least one sample time is needed

sys = simsizes(sizes);

% 对sizes赋值完之后，再调用simsizes指令，将定义好的sizes
% 数组作为参数，并把结果返回给sys变量。
% 其实，simsizes(sizes)只是把sizes数组组成一个长度为6的
% 向量，因此完全可以用一条简单的赋值语句代替上述赋值。
% sys=[0,			

			...
			...
			... to be continued.

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