MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario descargar pdf (Pagina 30)

2 Writing S-Functions As M-Files

2-6

Below are the S-function subroutines that timestwo.m calls:

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

% Function mdlInitializeSizes initializes the states, sample

% times, state ordering strings (str), and sizes structure.

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

function [sys,x0,str,ts] = mdlInitializeSizes

% Call function simsizes to create the sizes structure.

sizes = simsizes;

% Load the sizes structure with the initialization information.

sizes.NumContStates= 0;

sizes.NumDiscStates= 0;

sizes.NumOutputs= 1;

sizes.NumInputs= 1;

sizes.DirFeedthrough=1;

sizes.NumSampleTimes=1;

% Load the sys vector with the sizes information.

sys = simsizes(sizes);

x0 = []; % No continuous states

str = []; % No state ordering

ts = [-1 0]; % Inherited sample time

% End of mdlInitializeSizes.

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

% Function mdlOutputs performs the calculations.

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

function sys = mdlOutputs(t,x,u)

sys = 2*u;

% End of mdlOutputs.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario Pagina 30