 Usage:  {x1,x2,t}=table2(x)  
 
 Input:

  x                      n x 2 matrix, the columns correspond to the variables. 
                         
 Output:

  x1                     p x 1 vector, distinct realizations of x[,1]. 
                         
  x2                     q x 1 vector, distinct realizations of x[,2]. 
                         
  t                      p x q matrix, the absolute frequencies (the inner 
                         part of the crosstable). 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
