% Course:  	Signals and Systems, NTU-EE, Spring 2004
% Section: 	04
% ID: 		B91901XXX
% Name:		±i¤T¤¥
% E-mail:	abc@ntu.edu.tw
% Program #:1
% Date:		March XX, 2004
% File Name:HW1B91901XXX.m

clear all; close all;

%echo on

%%% define the variables you use if necessary

n = -15:1:100;  	% time index
x = sin(n);		% input signal
y = cos(2*pi/4*n);	% output signal 

%%%% ... etc.


%%% plot your result in separate figure, subplot, etc., if possible
%%% use different symbols to show distinct data if necessary

figure(11)
subplot(2,1,1)
   plot(t,r,'r')
   hold on
   plot(ycd(:,1),ycd(:,2))

   title('Step Responses of Digital and Continuous Controllers')
   ylabel('Position, y')
   xlabel('Time (sec)')
   legend(  )
   text(.33,.9, '\leftarrow continuous  controller')
   text(.7,1.3, 'digital  controller')
   grid
   hold off

%%% put proper title, labels, explanations, legend

subplot(2,1,2)
   plot( )
   hold on
   ylabel( )
   xlabel( )
   text()
   grid
   hold off

figure(12)
   plot( )
      