www.pudn.com > slidingmode5.rar > chap6_1plant.m

function [sys,x0,str,ts] = spacemodel(t,x,u,flag) 
 
switch flag, 
case 0, 
    [sys,x0,str,ts]=mdlInitializeSizes; 
case 1, 
    sys=mdlDerivatives(t,x,u); 
case 3, 
    sys=mdlOutputs(t,x,u); 
case {2,4,9} 
    sys=[]; 
otherwise 
    error(['Unhandled flag = ',num2str(flag)]); 
end 
 
function [sys,x0,str,ts]=mdlInitializeSizes 
sizes = simsizes; 
sizes.NumContStates  = 2; 
sizes.NumDiscStates  = 0; 
sizes.NumOutputs     = 2; 
sizes.NumInputs      = 1; 
sizes.DirFeedthrough = 0; 
sizes.NumSampleTimes = 1; 
sys = simsizes(sizes); 
x0 = [0.5;0]; 
 
str = []; 
ts = [0 0]; 
function sys=mdlDerivatives(t,x,u) 
 
sys(1)=x(2); 
sys(2)=-25*x(2)+133*u; 
function sys=mdlOutputs(t,x,u) 
sys(1)=x(1); 
sys(2)=x(2);