function output_data = unit_scale_data(data)
%
% function output_data = unit_scale_data(data)
%
% Scale an input data array so that the entire data range fits into the
% unit interval [0, 1]. Specifically, subtract the mean value from the
% array, and then divide by the data range (max - min).
%
% This is intended to be an example of the MATLAB debugger. Note that the
% function will fail if the array has more than 1 dimension, because of the
% array size mismatch between x and mean(x), when x is more than 1-D.

% compute min and max.
data_max = max(data);
data_min = min(data);

output_data = data;

% Rescale the data by first subtracting the minimum (the data is shifted to
% [0, max-min]), and then dividing by the range (data is scaled to [0,1])
output_data = output_data - data_min;
output_data = output_data / (data_max - data_min);