MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Scaricare il pdf (Pagina 43)

Examples of M-File S-Functions

2-19

sizes = simsizes;

sizes.NumContStates = 0;

sizes.NumDiscStates = 1;

sizes.NumOutputs = 1;

sizes.NumInputs = 2;

sizes.DirFeedthrough = 1; % flag=4 requires direct feedthrough

% if input u is involved in

% calculating the next sample time

% hit.

sizes.NumSampleTimes = 1;

sys = simsizes(sizes);

% Initialize the initial conditions.

x0 = [0];

% Set str to an empty matrix.

str = [];

% Initialize the array of sample times.

ts = [–2 0]; % variable sample time

% End of mdlInitializeSizes.

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

% mdlUpdate

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

% step requirements.

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

function sys = mdlUpdate(t,x,u)

sys = u(1);

% End of mdlUpdate.

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

% mdlOutputs

% Return the block outputs.

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

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Pagina 43