 Usage:  z = sker (x, h, K, y {, xest})   
 
 Input:

  x                      n x p x d1 x ... x dn array 
                         
  h                      1 x p x d1 x ... x dn array (global bandwidth) 
                         
                         n x p x d1 x ... x dn array (local bandwidth) 
                         
  K                      text (kernel) 
                         
  y                      n x m x d1 x ... x dn array 
                         
  xest                   k x p x d1 x ... x dn array 
                         
                         
 Output:

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