 Usage:  y = highepa(x, {q})  
 
 Input:

  x                      n x p matrix 
                         
  {q}                    order of the kernel, default is 2, can be 4, 6, 8 
                         
 Output:

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