function vals=q_uniform(N,s);
%function vals=q_uniform(N,s);
%
%N is the number of quantization levels
%s is a signal (row vector)
%vals are values of a uniform quantizer (col. vector). 

mins = min(s); 
maxs = max(s); 
Ns = length(s); 
range = maxs - mins; 
delta = range/N;
vals = linspace(mins + delta/2, maxs - delta/2, N)'; % needs column vector