 Usage:  ind = nninit (wei, unit)  
 
 Input:

  wei                    n x 3 matrix of weights 
                         
  unit                   m x 2 matrix of units 
                         
 Output:

  ind                    n x 1 reordering vector 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
