function [ Data_out ] = scaleData( Data, fmin, fmax)
[m, n] = size(Data); % m data points with n feature dimension
Data_out = zeros(m,n);
for i = 1 : n
    X = Data(:,i);
    Xmin = min(X); Xmax = max(X);
    X_std =  (X - Xmin) ./ (Xmax - Xmin);
    X_scaled = X_std .* (fmax - fmin) + fmin;
    Data_out(:,i) = X_scaled;
end
end