% function to generate signal of prescribed length
% Usage: [j,x] = makesignal(N)
% 
% where j are index from 0 to N-1
%       x are the generated signals
%       N is the length of the series
 
function [j,x] = makesignal(N)

% these declare and initialize j and x with length N.
j = zeros(N,1);
x = zeros(N,1);

% this makes j = 0, 1, ..., N-1
j = 0:N - 1;

% this is the part you have to modify for pset4, Q3
m = 1; 
x = cos(2*pi*m*j/N);

% To plot and see what the signal looks like, type
% >> plot(j,x);