60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
/***************************************************************************
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PUserFcn.cpp
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Author: Andreas Suter
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e-mail: andreas.suter@psi.ch
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***************************************************************************/
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/***************************************************************************
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* Copyright (C) 2007-2021 by Andreas Suter *
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* andreas.suter@psi.ch *
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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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#include <iostream>
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using namespace std;
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#include <cassert>
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#include "PUserFcn.h"
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ClassImp(PUserFcn)
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//------------------------------------------------------
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/**
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* <p> user function example: polynome of 3rd order
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*
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* \f[ = \sum_{k=0}^3 c_k t^k \f]
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*
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* <b>meaning of paramValues:</b> \f$c_0\f$, \f$c_1\f$, \f$c_2\f$, \f$c_3\f$
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*
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* <b>return:</b> function value
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*
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* \param t time in \f$(\mu\mathrm{s})\f$, or x-axis value for non-muSR fit
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* \param param parameter vector
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*/
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Double_t PUserFcn::operator()(Double_t t, const std::vector<Double_t> ¶m) const
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{
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// expected parameters: c0, c1, c2, c3
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assert(param.size() == 4);
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return param[0] + param[1]*t + param[2]*t*t + param[3]*t*t*t;
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}
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