function data_minus_mean = subtract_mean( data )
%
% function data_minus_mean = subtract_mean( data )
%
% compute the mean of the input data, then subtract the mean and return the
% result.
% This is not a particularly useful function. It will be used to
% demonstrate use of the MATLAB debugger.
%

data_mean = mean(data);
data_minus_mean = data - data_mean;