fig89.m

realize analysis and design for computer-controlled system

% Generates Fig 8.9
% Computer Controlled Systems (3rd ed)
% Author: B. Wittenmark
% Last edit: 1997-07-09
% Copyright (c) 1996 by K. J. 舠tr鰉, B. Wittenmark and
% Department of Automatic Control, Lund Institute of
% Technology, Lund, Sweden

newplot;clf;
set(gcf,'PaperUnits','centimeters','PaperPosition',[2 2 13 10])
set(gcf,'Units','centimeters','position',get(gcf,'PaperPosition'))
clear
lw=0.9;

block89;

ulow=-10000;
uhigh=10000;
%
[t,x,y]=sim('block89',[0, 80]);
subplot(3,1,1);
plot(t,y(:,3),'k:',t,y(:,2),'k--','Linew',lw);
hold on;
axis([0,80,0,2]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 20 40 60 80]);
set(gca,'ytick',[0 1 2]);
ylabel('Output','Fontname','NewCenturySchlbk','Fontsize',9)
drawnow;
%
subplot(3,1,2);
plot(t,y(:,1),'k--','Linew',lw);
hold on;
axis([0,80,-0.11,0.11]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 20 40 60 80]);
set(gca,'ytick',[-0.1 0 0.1]);
ylabel('Input','Fontname','NewCenturySchlbk','Fontsize',9)
xlabel('Time','Fontname','NewCenturySchlbk','Fontsize',9)
drawnow;
%
ulow=-0.1;
uhigh=0.1;
%set_param('block89/PID','ulow',low);
%set_param('block89/PID','uhigh',uhigh);
[t,x,y]=sim('block89',[0, 80]);
subplot(3,1,1);
plot(t,chop(y(:,2),4,5),'k-','Linew',lw);
drawnow;
%
subplot(3,1,2);
plot(t,y(:,1),'k-','Linew',lw);
hold off
drawnow;
%
ylblalgn