sfun08832_2.m

matlab mfiles实例分析

%sfun08832_2.m
function [sys,x0,str,ts] = sfun08832_2(t,x,u,flag)
switch flag,
case 0,
    [sys,x0,str,ts]=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
    error(['Unhandled flag = ',num2str(flag)]);
end

function [sys,x0,str,ts]=mdlInitializeSizes
sizes = simsizes;
sizes.NumContStates  = 2;                           %两个连续状态变量
sizes.NumDiscStates  = 0;
sizes.NumOutputs     = 2;                           %输出两个变量
sizes.NumInputs      = 0;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1; 

sys = simsizes(sizes);
x0  = [0;2];										%给定初值
str = [];
ts  = [0 0];

function sys=mdlDerivatives(t,x,u)
sys=zeros(size(x));
sys(1)=x(1).*(1-x(2).*x(2))-x(2);
sys(2)=x(1);

function sys=mdlUpdate(t,x,u)
sys = [];

function sys=mdlOutputs(t,x,u)
sys =x;										    	%输出x

function sys=mdlGetTimeOfNextVarHit(t,x,u)
sampleTime = 1;    
sys = t + sampleTime;

function sys=mdlTerminate(t,x,u)
sys = [];