QtiPlot 0.9.8.2
SigmoidalFit.h
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00001 /***************************************************************************
00002     File                 : SigmoidalFit.h
00003     Project              : QtiPlot
00004     --------------------------------------------------------------------
00005     Copyright            : (C) 2007 by Ion Vasilief
00006     Email (use @ for *)  : ion_vasilief*yahoo.fr
00007     Description          : Sigmoidal (Boltzmann) Fit class
00008 
00009  ***************************************************************************/
00010 
00011 /***************************************************************************
00012  *                                                                         *
00013  *  This program is free software; you can redistribute it and/or modify   *
00014  *  it under the terms of the GNU General Public License as published by   *
00015  *  the Free Software Foundation; either version 2 of the License, or      *
00016  *  (at your option) any later version.                                    *
00017  *                                                                         *
00018  *  This program is distributed in the hope that it will be useful,        *
00019  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
00020  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
00021  *  GNU General Public License for more details.                           *
00022  *                                                                         *
00023  *   You should have received a copy of the GNU General Public License     *
00024  *   along with this program; if not, write to the Free Software           *
00025  *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
00026  *   Boston, MA  02110-1301  USA                                           *
00027  *                                                                         *
00028  ***************************************************************************/
00029 #ifndef SIGMOIDALFIT_H
00030 #define SIGMOIDALFIT_H
00031 
00032 #include "Fit.h"
00033 
00034 class SigmoidalFit : public Fit
00035 {
00036     Q_OBJECT
00037 
00038     public:
00039         SigmoidalFit(ApplicationWindow *parent, QwtPlotCurve *);
00040         SigmoidalFit(ApplicationWindow *parent, QwtPlotCurve *, double, double);
00041         SigmoidalFit(ApplicationWindow *parent, Graph *g);
00042         SigmoidalFit(ApplicationWindow *parent, Graph *g, const QString& curveTitle);
00043         SigmoidalFit(ApplicationWindow *parent, Graph *g, const QString& curveTitle, double start, double end);
00044         SigmoidalFit(ApplicationWindow *parent, Table *t, const QString& xCol, const QString& yCol, int startRow = 1, int endRow = -1);
00045 
00046         double eval(double *par, double x){return (par[0]-par[1])/(1+exp((x-par[2])/par[3]))+par[1];};
00047 
00048         void guessInitialValues();
00049         void setLogistic(bool on = true);
00050 
00051     private:
00052         void init();
00053         void calculateFitCurveData(double *X, double *Y);
00054 
00055         bool d_logistic;
00056 };
00057 
00058 #endif