 Usage:  {ur, bn1, bn2} = hardthres (usel, b1, b2, x)  
 
 Input:

  usel                   vector commands 
                         
  b1                     n x 3 array of mother wavelet coefficient 
                         
  b2                     n x 3 array of mother wavelet coefficient 
                         
  x                      m x 1 array of data 
                         
 Output:

  ur                     vector commands 
                         
  bn1                    n x 3 array of thresholded mother wavelet coefficient 
                         
  bn2                    n x 3 array of thresholded mother wavelet coefficient 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
