function z = add2vectors(a,b)
% ADD2VECTORS Sum of two vectors. 
%   z = add2vectors(x, y) adds the vectors x and y. If the vectors
%   x and y are not the same length, then the smaller vector
%   is padded with zeros. The sum is stored in a column vector z
%   with length max(length(x), length(y)).
%
%   Example: If A = [2 3] and B = [1 2 3] then
%                Z = add2vectors(A, B) 
%           returns Z = [3
%                        5 
%                        3].

% Don Hummels
% ECE 486 - Example MATLAB function
% January 22, 2008

a = a(:);   % Force the two input vectors to be column vectors.
b = b(:);

%
% Check if the two input vectors are the same length. If not
% pad the smaller vector with zeros and proceed with the vector
% addition.
%
if (length(a) ~= length(b))
    if(length(a)<length(b))
        a = [a; zeros(abs(length(a)-length(b)),1)];
    else
        b = [b; zeros(abs(length(a)-length(b)),1)];
    end
end

z = a + b; % The output z is a column vector