74 lines
3.6 KiB
C++
74 lines
3.6 KiB
C++
/***************************************************************************
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ZFRelaxation.cpp
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Author: Bastian M. Wojek
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$Id$
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***************************************************************************/
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/***************************************************************************
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* Copyright (C) 2009 by Bastian M. Wojek *
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* *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#define TWO_PI 6.28318530717958623
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#define DEG_TO_RAD 0.0174532925199432955
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#include "ZFRelaxation.h"
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#include <cassert>
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#include <cmath>
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#include <vector>
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using namespace std;
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ClassImp(ZFMagGss)
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ClassImp(ZFMagExp)
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//--------------------------------------------------------------------------
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// ZFMagGss::operator()
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//--------------------------------------------------------------------------
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/**
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* <p>Method returning the function value at a given time for a given set of parameters.
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*
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* \param t time \htmlonly (μs) \endhtmlonly \latexonly ($\mu\mathrm{s}$) \endlatexonly
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* \param par parameters [\htmlonly α (1), ν (MHz), σ<sub>T</sub>; (μs<sup>-1</sup>), σ<sub>L</sub>; (μs<sup>-1</sup>)\endhtmlonly \latexonly $\alpha~(1)$, $\nu~(\mathrm{MHz})$, $\sigma_{\mathrm{T}}~(\mu\mathrm{s}^{-1})$, $\sigma_{\mathrm{L}}~(\mu\mathrm{s}^{-1})$ \endlatexonly]
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*/
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double ZFMagGss::operator()(double t, const vector<double> &par) const {
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assert(par.size()==4);
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double w(TWO_PI * par[1]), sst(par[2]*par[2]*t);
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return par[0] * (cos(w*t) - sst/w*sin(w*t)) * exp(-0.5*sst*t) + (1.0-par[0]) * exp(-0.5*par[3]*par[3]*t*t);
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}
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//--------------------------------------------------------------------------
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// ZFMagExp::operator()
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//--------------------------------------------------------------------------
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/**
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* <p>Method returning the function value at a given time for a given set of parameters.
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*
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* \param t time \htmlonly (μs) \endhtmlonly \latexonly ($\mu\mathrm{s}$) \endlatexonly
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* \param par parameters [\htmlonly α (1), ν (MHz), <i>a</i><sub>T</sub>; (μs<sup>-1</sup>), <i>a</i><sub>L</sub>; (μs<sup>-1</sup>)\endhtmlonly \latexonly $\alpha~(1)$, $\nu~(\mathrm{MHz})$, $a_{\mathrm{T}}~(\mu\mathrm{s}^{-1})$, $a_{\mathrm{L}}~(\mu\mathrm{s}^{-1})$ \endlatexonly]
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*/
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double ZFMagExp::operator()(double t, const vector<double> &par) const {
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assert(par.size()==4);
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double w(TWO_PI * par[1]);
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return par[0] * (cos(w*t) - par[2]/w*sin(w*t)) * exp(-par[2]*t) + (1.0-par[0]) * exp(-par[3]*t);
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}
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