HW2-A Collin Phillips ECE301Fall2008mboutin - Rhea

Homework 2 Part A-1

I chose the signal:
$ y = cos(n)\, $
When I took a sample at 1 hz, the signal was ugly and random.
Therefore it is not periodic.

File:Non-periodic.jpg ECE301Fall2008mboutin
Changing the function to:$ y = cos(n*pi/2)\, $
made the signal look periodic.

Part A-2

I chose the signal y=log(x)
This code is not periodic, but taking a piece of it and
Repeating it will make it periodic

Here is the code I used:

dt = .00001;
periodlength = 5;
periods = 10;

t = [dt:dt:periodlength];
y = log(t);
x = [];
for i=1:periods
   x = [x,y];
end
t = [dt:dt:periodlength*periods];
plot(t,x)