% Lab 1
% Question 1 on aliasing

fs=100;						% Sampling frequency [Hz]
ts=1/fs;					% Sampling period [s]

n=0:1:9;					% Sample indicies
x20(n+1)=cos(2*pi*20*n*ts); % x[n] with f = 20 [Hz]
x80(n+1)=cos(2*pi*80*n*ts); % x[n] with f = 80 [Hz]

subplot(211)				% Start top sub plot
stem(n,x20,'linewidth',2)	% Plot samples of x[n] with f = 20[Hz] for all n
subplot(212)				% Start bottom sub plot
stem(n,x80,'linewidth',2)	% Plot samples of x[n] with f = 80[Hz] for all n
xlabel('f = 20 and 80 Hz'); % Label the x axis