matlab-simulink中s-function函数…

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概述

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function [sys,x0,str,ts] = sfunt(t,x,u,flag,b) %定义函数名称：sfunt

switch flag,

end

% end sfuntmpl

%=============================================================================

% mdlInitializeSizes

% Return the sizes, initial conditions, and sample times for the S-function.

%=============================================================================

function [sys,x0,str,ts]=mdlInitializeSizes

%调用函数simsizes以创建结构体sizes

sizes = simsizes;

%用初始化信息填充结构体sizes

sizes.NumContStates

sizes.NumDiscStates

sizes.NumOutputs

sizes.NumInputs

sizes.DirFeedthrough = 0; %不包含直接馈通（输出量中不含输入量）

sizes.NumSampleTimes = 1; % （单个采样周期）at least on

%根据上面的设置设定系统初始化参数

sys = simsizes(sizes);

%给其他返回参数赋值

% initialize the initial conditions

% str is always an empty matrix

str = []; %将str变量设置为空字符串

% initialize the array of sample times

%初始化子程序结束

% end mdlInitializeSizes

%=============================================================================

% mdlDerivatives

% Return the derivatives for the continuous states.

%=============================================================================

function sys=mdlDerivatives(t,x,u)

% end mdlDerivatives

%=============================================================================

% mdlUpdate

% Handle discrete state updates, sample time hits, and major time step

% requirements.

%=============================================================================

function sys=mdlUpdate(t,x,u)

sys = [];

% end mdlUpdate

%=============================================================================

% mdlOutputs：当flag值为3时，计算输出量

% Return the block outputs.

%=============================================================================

function sys=mdlOutputs(t,x,u,b)

if(x <= b)

else

end

% end mdlOutputs

%=============================================================================

% mdlGetTimeOfNextVarHit

% Return the time of the next hit for this block.

% absolute time.

% variable discrete-time sample time [-2 0] in the sample time array in

% mdlInitializeSizes.

%=============================================================================

function sys=mdlGetTimeOfNextVarHit(t,x,u)

sampleTime = 1;

sys = t + sampleTime;

% end mdlGetTimeOfNextVarHit

%=============================================================================

% mdlTerminate

% Perform any end of simulation tasks.

%=============================================================================

function sys=mdlTerminate(t,x,u)

sys = [];

% end mdlTerminate

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