 Usage:  mh = lpderxest (x, h {,q {,p {,K} {,v}}})  
 
 Input:

  x                      n x 2, the data. In the first column the 
                         independent, in the second column the 
                         dependent variable. 
                         
  h                      scalar, bandwidth. If not given, the rule of thumb 
                         bandwidth computed by lpderrot is used. 
                         
  q                      integer <=2, order of derivative. If not 
                         given, q=1 (first derivative) is used. 
                         
  p                      integer, order of polynomial. If not given, 
                         p=q+1 is used for q<2, p=q is used for q=2. 
                         
  v                      m x 1, values of the independent variable on 
                         which to compute the regression. If not given, 
                         x is used. 
                         
 Output:

  mh                     n x 2 or m x 2 matrix, the first column is the 
                         sorted first column of x or the sorted v, the 
                         second column contains the derivative estimate 
                         on the values of the first column. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
