 Usage:  z = y + x  
 
 Input:

  x                      n1 x n2 x ... x np array 
                         
  y                      m1 x m2 x ... x mp array 
                         
 Output:

  z                      max(n1,m1) x max(n2,m2) x ... x max(np,mp) array 
                         
                         
--------------------------------------------------------------
(C) MD*TECH Method and Data Technologies, 17.8.2000
