 Usage:  locpol(x, xg, y, h, logi)  
 
 Input:

  x                      n x d matrix explanatory variables 
                         
  xg                     m x d matrix grid points at which the estimation will be done 
                         
  y                      n x q matrix dependent variable 
                         
  h                      d x 1 matrix vector of bandwidthes 
                         
  logi                   logical scalar 0 if linear, 1 if quadratic polynomials are wished 
                         
 Output:

  mh                     m x dd x q matrix regression function and its v'th derivatives 
                         divided by v at xg in the following order: 
                         regression function, 
                         first derivatives respectively x1, x2, x3, ... , 
                         derivatives respectively x1x1, x1x2, ..., x2x2, x2x3, ... 
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
