function output=unnomal(input,reference,strength)
%this function is designed for un-normalizing the data set.
%input              the data which will be un-normalized.
%reference          the reference of unnormalizing
%strength           the desired max of the data
%if there is only one argument, the strength is equal to 1.
%
%
%
%
%edit by bruce, June 8, 2006
%
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if nargin<3
    strength=1;
end
if nargin<2
    error('missing a argument');
end 
output=mean(reference)+(max(reference)-min(reference))*input/strength;