/*
 * lsq.h
 */

struct lsq {
  double sum_xi, sum_yi, sum_xi_2, sum_xi_yi;
  int sum_n;
} ;

 
extern void  least_squares(double *, double *, int, double *, double *, struct lsq *) ; 
extern void  least_squares_update(double, double, double *, double *, struct lsq *) ;
extern double least_squares_error(double *, double *, int, double, double) ;
extern double least_squares_max_error(double *, double *, int, double, double);