Erfc.h

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/* -*- mode: c++ -*- */

#ifndef _Erfc_H_
#define _Erfc_H_

#include "FunctionBase.h"

namespace hippodraw {

class MDL_HIPPOPLOT_API Erfc : public FunctionBase
{
 private:
  enum{MEAN,SIGMA,NORM};

 protected:
  virtual void initialize();

 public:
  Erfc ();
  
  Erfc ( double mean, double sigma, double norm );
  
  virtual FunctionBase * clone () const;
  
  virtual double operator () ( double x ) const;
  
  virtual void initialParameters ( const FunctionHelper * helper );
  
  //Help functions:
  double calcErfc(double x) const;

 protected:
  virtual double derivByParm ( int i, double x ) const;

  double derivByRed ( double value) const;

private:
  inline double calcRed(double value) const 
  {
    if(m_parms[SIGMA] == 0.0) {
      Erfc * p = const_cast < Erfc * > ( this );
      p->m_parms[SIGMA] = 0.0001; //dummy lower value
    }

    return (value - m_parms[MEAN])/m_parms[SIGMA];
  }



};

} // namespace hippodraw

#endif// _Erfc_H_