How to fix up my s function?

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Maidul Islam 2016-6-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289445-how-to-fix-up-my-s-function

评论： Walter Roberson 2016-6-13

function [sys,x0,str,ts,simStateCompliance] = fcnuav_1d_sfun(t,x,u,flag)
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      = 2;
sizes.DirFeedthrough = 0;
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)
m = 0.18;
g = 9.81;
kp = 18;
kd = 175;
zdot2_des = 0;
e = u;
U = m*(zdot2_des+kp*e(2)+kd*e(1)+g);
sys = [U];
function sys=mdlGetTimeOfNextVarHit(t,x,u)
sampleTime = 1;    
sys = t + sampleTime;
function sys=mdlTerminate(t,x,u)
sys = [];

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Walter Roberson 2016-6-13

We might be able to suggest a dating site for lonely functions, but I think it would probably be even better if you described the difficulty you are encountering with the code including any error message.

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