 Usage:  z = mknn (x, k{, y})  
 
 Input:

  y                      m x p x d1 x ... x dn array 
                         
  x                      n x p x d1 x ... x dn array 
                         
  k                      scalar (number of neighbors) 
                         
 Output:

  z                      m x k x d1 x ... x dn array 
                         
--------------------------------------------------------------
(C) MD*TECH Method and Data Technologies, 17.8.2000
