Errors with s-function level 1 in simulink

  1. Hi all,

    I am modeling a separator model with pressure and water level as 2 variables.
    I first made an m-file(hamda.m) with ode23tb, which is working( 4 plots: pressure, water level, flow of liq output and flow of gas output.
    then I used an level 1 s-function( gabileh) applying the m-file(hamda.m) I created as fellow
    function [sys,x0,str,ts,simStateCompliance] = gabileh(t,x,u,flag,varargin)

    % M-File S-Function implementing

    QLi = u(1); Qgi = u(2); kv1 = u(3); kv2 = u(4);


    switch flag,

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

    %%%%%%%%%%%%%%%
    % Derivatives %
    %%%%%%%%%%%%%%%

    case 1,
    sys = mdlDerivatives(t,x,u,QLi,Qgi,kv1,kv2);

    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    % Update, Output, and Terminate %
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    case {2, 4, 9},
    sys = []; % do nothing

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

    otherwise
    DAStudio.error('Simulink:blocks:unhandledFlag', num2str(flag));
    end


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

    sizes = simsizes;
    sizes.NumContStates = 2;
    sizes.NumDiscStates = 0;
    sizes.NumOutputs = 4;
    sizes.NumInputs = 4;
    sizes.DirFeedthrough = 0;
    sizes.NumSampleTimes = 1;

    sys = simsizes(sizes);

    x0 = [];
    str = [];
    ts = [0 0]; % continuous sample time: [period, offset]

    % Specify the block simStateCompliance. The allowed values are:
    % 'UnknownSimState', < The default setting; warn and assume DefaultSimState

    simStateCompliance = 'UnknownSimState';

    % end mdlInitializeSizes

    %
    %===================================================================================
    % mdlDerivatives
    %
    %===================================================================================
    %
    function sys = mdlDerivatives(t,x,u,varargin)

    QLi = u(1); Qgi = u(2); kv1 = u(3); kv2 = u(4);

    sys = hamda(t,x,u);

    % end mdlInitializeSizes

    %=============================================================================
    % mdlOutputs
    % Return the output vector for the S-function
    %=============================================================================
    %
    function sys = mdlOutputs(t,x,u)
    sys =Qgt;
    sys =QLt;
    sys = x;


    % end mdlOutputs


    when I used the level-1 s-function in a simulink with 4 inputs and 4 ouputs,
    I keep having the same error:

    Error in 'seprig/M-file S-Function1' while executing M-File S-function 'gabileh', flag = 0 (initialize), at start of simulation. MATLAB error message:
    Attempted to access u(1); index out of bounds because numel(u)=0.

    please help, thanks in adavance
     
    Last edited: Sep 26, 2011
  2. jcsd
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