sect.m

some simulation of dtc coommand my name is belmhel ahmed my tel [phone]

 function [sys,x0,str,ts]=zon(t,x,u,flag)
%dispath the flag.the switch function controls the calls to
%s_function routines at each simulation stage.
switch flag;
    case 0 
sizes =simsizes;
%Loadthe sizes structure witth the initialisation informatio .
sizes.NumContStates=0;
sizes.NumDiscStates=0;
sizes.NumOutputs=1;
sizes.NumInputs=1;
sizes.DirFeedthrough=1;
sizes.NumSampleTimes=1;
%Loadthe sys vector with sizes information .
sys=simsizes(sizes);
x0=[];%no continous statse
%
str=[];%no state ordiring 
%
ts=[-1 0];%inherited sample time
%end of initialisation sizes
    case 3
%interval des zones
A=[-30 30];
B=[30 90];
C=[90 150];
D=[150 210];
E=[210 270];
F=[270 330];
%detection de la zones pour 1 entree u
 alpha=u
%----------------------zoneA
if alpha>=A(1)& alpha<=A(2)
    sys=1
    
%----------------------zoneB
elseif alpha>=B(1)& alpha<=B(2)
    sys=2

%----------------------zoneC
elseif alpha>=C(1)& alpha<=C(2)
    sys=3
%----------------------zoneD
elseif alpha>=D(1)& alpha<=D(2)
    sys=4
%----------------------zoneE
elseif alpha>=E(1)& alpha<=E(2)
    sys=5
%----------------------zoneF
elseif alpha>=F(1)& alpha<=F(2)
    sys=6
end;
    case {1,2,4,9}
        sys=[];%unused flags
    otherwise
 error(['unhanddled flag=',num2str(flag)]);%error handling
end;%end of function timestwo