 Usage:  y = symweigh (x, h, n, f)  
 
 Input:

  x                      n x 1 vector 
                         
  h                      n x 1 vector or number 
                         
  n                      n x 1 vector or number 
                         
  f                      1 x 1 address of function 
                         
 Output:

  y                      k x 1 matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
