function output=normalize(input,strength)
%this function is designed for normalizing the data set.
%input              the data which will be normalized.
%strength           the desired max of the data
%if there is only one argument, the strength is equal to 1.
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%edit by bruce, June 8, 2006
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if nargin<2
    strength=1;
end 

output=(input-mean(input))*strength/(max(input)-min(input));