 Usage:  {xc, yc, fill} = conv (xb, yb, wx, wy {,sym})   
 
 Input:

  xb                     m x p x d1 x ... x dn array of integers 
                         
  yb                     m x l x d1 x ... x dn array of non-negative integers 
                         
  wx                     r x p x d1 x ... x dn array of non-negative integers 
                         
  wy                     r x 1x d1 x ... x dn array 
                         
  sym                    scalar 
                         
                         
 Output:

  xc                     k x p x d1 x ... x dn array (k >= m) 
                         
  yc                     k x l x d1 x ... x dn array 
                         
  fill                   k x 1 x d1 x ... x dn array of zeros or ones 
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
