Hello, a error has come in my s-function kindly help me....

error

An error occurred while running the simulation and the simulation was terminated Caused by: Error in 'untitled/S-Function' while executing MATLAB S-function 'chap1_1ctrl', flag = 3 (output), at time 0.0. Too many input arguments.

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function [sys, x0, str, ts]=chap1_1ctrl(t,x,u,flag)
switch flag,
    case 0,
        [sys, x0, str, ts]=mdlInitializeSizes;
    case 1,
        sys=mdlDerivatives(t,x,u,J);
    case 3,
        sys=mdlOutputs(t,x,u,J);
    case{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;
        sizes.NumInputs=3;
        sizes.DirFeedthrough=1;
        sizes.NumSampleTimes=0;
        sys=simsizes(sizes);
        x0=[];
        str=[];
        ts=[];
        function sys=mdlOutputs(t,x,u)
            J=2;
            thd=u(1);
            th=u(2);
            dth=u(3);
            e=th-thd;
            de=dth;
            c=10;
            s=c*e+de;
            xite=1.1;
            k=0;
            %k=10;
            ut=J*(-c*dth-1/J*(k*s+xite*sign(s)));
            sys(1)=ut;

Answer 1

[Geoff Hayes]

Abdul - in the chap1_1ctrl function, you have the following code

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

where you are passing four input parameters into the mdlDerivatives function. In the same piece of code, you have included this function

    function sys=mdlOutputs(t,x,u)

which has (according to its signature) only three input parameters. I suspect that this is the source of the error too many input arguments. Either you are passing too many input parameters or this function needs to accept a fourth parameter.