ccstruct/quadlsq.h

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#ifndef           QUADLSQ_H
#define           QUADLSQ_H

#include          "points.h"

class QLSQ
{
  public:
    QLSQ() {  //constructor
      clear();  //set to zeros
    }
    void clear();  //initialize

    void add(           //add element
             double x,  //coords to add
             double y);
    void remove(           //delete element
                double x,  //coords to delete
                double y);
    INT32 count() {  //no of elements
      return n;
    }

    void fit(              //fit the given
             int degree);  //return actual
    double get_a() {  //get x squard
      return a;
    }
    double get_b() {  //get x squard
      return b;
    }
    double get_c() {  //get x squard
      return c;
    }

  private:
    INT32 n;                     //no of elements
    double a, b, c;              //result
    double sigx;                 //sum of x
    double sigy;                 //sum of y
    double sigxx;                //sum x squared
    double sigxy;                //sum of xy
    double sigyy;                //sum y squared
    long double sigxxx;          //sum x cubed
    long double sigxxy;          //sum xsquared y
    long double sigxxxx;         //sum x fourth
};
#endif

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