PacExponential.h

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/***************************************************************************
 *   Copyright (C) 2008-2010 by Matthias Nagl                              *
 *   mnagl@uni-goettingen.de                                               *
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 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
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 *   (at your option) any later version.                                   *
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 *   This program is distributed in the hope that it will be useful,       *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
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#ifndef PACEXPONENTIAL_H
#define PACEXPONENTIAL_H

#include <vector>
#include <math.h>
#include "PacAbstractFitFunction.h"
#include <QtDebug>

class PacExponential : public PacAbstractFitFunction
{
public:
  PacExponential(const std::vector<double> &params);
  PacExponential();
  ~PacExponential();

  QList<Pac::FitParameterProperties> parameterProperties() const;
  QPixmap formulaAsPixmap() const;
  QString formulaExplanation() const;

  QVector<double> fitResultCurve(const QVector<double> &xvals, const ROOT::Minuit2::MnUserParameterState &params) const;
  double operator()(const std::vector<double> &x) const;

private:
  inline double myexp(double x, double a, double b, double t) const {
    return a * pow( 2.0, -x/t ) + b;
  };
};

#endif