From: gg@wywalTOinfogenia.pl   
      
   > What is the advantage to sum the ( occurence x normalized occurence   
   > )in a column and then divided by the total normalized occurence?   
   > What is the advantage in calculating center by using a fuzzy weight ?   
      
   It's not the matter of the choice.   
   This is calculated this way because then it can be an minimum of the special   
   function which c-means alg is supposed to minimize.   
   This is the idea of c-means algorithm and it works this way because   
   mathematics which is behind it implies this equation.   
      
       greg   
      
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