其中根据软件自带的程序模版修改了一段程序,实现的是simulink里的gain模块的功能,其中代码如下:
function [sys,x0,str,ts,simStateCompliance] = sfungain(t,x,u,flag,gain)
switch flag,
case 0,
[sys,x0,str,ts,simStateCompliance]=mdlInitializeSizes;
case 1,
sys=mdlDerivatives(t,x,u);
case 2,
sys=mdlUpdate(t,x,u);
case 3,
sys=mdlOutputs(t,x,u);
case 4,
sys=mdlGetTimeOfNextVarHit(t,x,u);
case 9,
sys=mdlTerminate(t,x,u);
otherwise
DAStudio.error('Simulink:blocks:unhandledFlag', num2str(flag));
end
function [sys,x0,str,ts,simStateCompliance]=mdlInitializeSizes
sizes = simsizes;
sizes.NumContStates = 0;
sizes.NumDiscStates = 0;
sizes.NumOutputs = 1;
sizes.NumInputs = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;
sys = simsizes(sizes);
x0 = [];
str = [];
ts = [0 0];
simStateCompliance = 'UnknownSimState';
function sys=mdlDerivatives(t,x,u)
sys = [];
function sys=mdlUpdate(t,x,u)
sys = [];
function sys=mdlOutputs(t,x,u)
sys =gain*u;
function sys=mdlGetTimeOfNextVarHit(t,x,u)
sampleTime = 1;
sys = t + sampleTime;
function sys=mdlTerminate(t,x,u)
sys = [];
然后搭建simulink环境,选择一个常熟值作为输入u,然后在S函数里将M文件与其连接,然后在S函数中对S-function parameters进行赋值运行后提示错误说没有定义gain这个变量,可是我在查找资料的过程中发现根本不用定义啊,请高人解释下怎么回事,谢谢