function q = sample_quantiles(x,p)
% SAMPLE_QUANTILES - returns the sample quantiles for the given set of data and percentages p
%
% Input:
%   x: the input data (one dimensional vector)
%   p: the quantiles we desire to compute
% 
% Written by:
% -- 
% John L. Weatherwax                2008-02-20
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

n  = length(x);
xs = sort(x); 

% convert percentiles into indices into the order statistics:
ind = floor(p*n+0.5);
% get the quantiles: 
q = xs(ind);