LauMagPhaseCoeffSet.cc

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// Copyright University of Warwick 2006 - 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// Authors:
// Thomas Latham
// John Back
// Paul Harrison

#include <iostream>
#include <fstream>
#include <vector>
using std::cout;
using std::cerr;
using std::endl;

#include "TMath.h"
#include "TRandom.h"

#include "LauComplex.hh"
#include "LauConstants.hh"
#include "LauMagPhaseCoeffSet.hh"
#include "LauParameter.hh"
#include "LauPrint.hh"
#include "LauRandom.hh"

ClassImp(LauMagPhaseCoeffSet)


LauMagPhaseCoeffSet::LauMagPhaseCoeffSet(const TString& compName, Double_t magnitude, Double_t phase, Bool_t magFixed, Bool_t phaseFixed) :
        LauAbsCoeffSet(compName),
        minMag_(-10.0),
        maxMag_(+10.0),
        minPhase_(-LauConstants::threePi),
        maxPhase_(+LauConstants::threePi),
        magnitude_(new LauParameter("A",magnitude,minMag_,maxMag_,magFixed)),
        phase_(new LauParameter("Delta",phase,minPhase_,maxPhase_,phaseFixed))
{
        // Print message
        cout<<"Set component \""<<this->name()<<"\" to have magnitude = "<<magnitude_->value()<<" and phase = "<<phase_->value()<<"."<<endl;
}

LauMagPhaseCoeffSet::LauMagPhaseCoeffSet(const LauMagPhaseCoeffSet& rhs, Double_t constFactor) : LauAbsCoeffSet(rhs.name())
{
        minMag_ = rhs.minMag_;
        maxMag_ = rhs.maxMag_;
        minPhase_ = rhs.minPhase_;
        maxPhase_ = rhs.maxPhase_;
        magnitude_ = rhs.magnitude_->createClone(constFactor);
        phase_ = rhs.phase_->createClone(constFactor);
}

LauMagPhaseCoeffSet& LauMagPhaseCoeffSet::operator=(const LauMagPhaseCoeffSet& rhs)
{
        if (&rhs == this) {
                return *this;
        }
        this->name(rhs.name());
        minMag_ = rhs.minMag_;
        maxMag_ = rhs.maxMag_;
        minPhase_ = rhs.minPhase_;
        maxPhase_ = rhs.maxPhase_;
        magnitude_ = rhs.magnitude_->createClone();
        phase_ = rhs.phase_->createClone();
        return *this;
}

std::vector<LauParameter*> LauMagPhaseCoeffSet::getParameters()
{
        std::vector<LauParameter*> pars;
        pars.push_back(magnitude_);
        pars.push_back(phase_);
        return pars;
}

void LauMagPhaseCoeffSet::printTableHeading(std::ostream& stream)
{
        stream<<"\\begin{tabular}{|l|c|c|}"<<endl;
        stream<<"\\hline"<<endl;
        stream<<"Component & Magnitude & Phase \\\\"<<endl;
        stream<<"\\hline"<<endl;
}

void LauMagPhaseCoeffSet::printTableRow(std::ostream& stream)
{
        LauPrint print;
        TString resName = this->name();
        resName = resName.ReplaceAll("_", "\\_");
        stream<<resName<<"  &  $";
        print.printFormat(stream, magnitude_->value());
        stream<<" \\pm ";
        print.printFormat(stream, magnitude_->error());
        stream<<"$  &  $";
        print.printFormat(stream, phase_->value());
        stream<<" \\pm ";
        print.printFormat(stream, phase_->error());
        stream<<"$ \\\\"<<endl;
}

void LauMagPhaseCoeffSet::randomiseInitValues()
{
        if (magnitude_->fixed() == kFALSE) {
                // Choose a magnitude between 0.0 and 2.0
                Double_t mag = LauRandom::zeroSeedRandom()->Rndm()*2.0;
                magnitude_->initValue(mag); magnitude_->value(mag);
        }
        if (phase_->fixed() == kFALSE) {
                // Choose a phase between +- pi
                Double_t phase = LauRandom::zeroSeedRandom()->Rndm()*LauConstants::twoPi - LauConstants::pi;
                phase_->initValue(phase); phase_->value(phase);
        }
}

void LauMagPhaseCoeffSet::finaliseValues()
{
        // retrieve the current values from the parameters
        Double_t mag      = magnitude_->value();
        Double_t phase    = phase_->value();
        Double_t genPhase = phase_->genValue();

        // Check whether we have a negative magnitude.
        // If so make it positive and add pi to the phase.
        if (mag < 0.0) {
                mag *= -1.0;
                phase += LauConstants::pi;
        }

        // Check now whether the phase lies in the right range (-pi to pi).
        Bool_t withinRange(kFALSE);
        while (withinRange == kFALSE) {
                if (phase > -LauConstants::pi && phase < LauConstants::pi) {
                        withinRange = kTRUE;
                } else {
                        // Not within the specified range
                        if (phase > LauConstants::pi) {
                                phase -= LauConstants::twoPi;
                        } else if (phase < -LauConstants::pi) {
                                phase += LauConstants::twoPi;
                        }
                }
        }

        // A further problem can occur when the generated phase is close to -pi or pi.
        // The phase can wrap over to the other end of the scale -
        // this leads to artificially large pulls so we wrap it back.
        Double_t diff = phase - genPhase;
        if (diff > LauConstants::pi) {
                phase -= LauConstants::twoPi;
        } else if (diff < -LauConstants::pi) {
                phase += LauConstants::twoPi;
        }

        // finally store the new values in the parameters
        // and update the pulls
        magnitude_->value(mag);  magnitude_->updatePull();
        phase_->value(phase);  phase_->updatePull();
}

LauComplex LauMagPhaseCoeffSet::particleCoeff()
{
        LauComplex coeff(magnitude_->value()*TMath::Cos(phase_->value()), magnitude_->value()*TMath::Sin(phase_->value()));
        return coeff;
}

LauComplex LauMagPhaseCoeffSet::antiparticleCoeff()
{
        return this->particleCoeff();
}

void LauMagPhaseCoeffSet::setCoeffValues( const LauComplex& coeff, const LauComplex& coeffBar )
{
        LauComplex average( coeff );
        average += coeffBar;
        average.rescale( 0.5 );

        magnitude_->value( average.abs() );
        phase_->value( average.arg() );
}

LauParameter LauMagPhaseCoeffSet::acp()
{
        TString parName(this->baseName()); parName += "_ACP";
        return LauParameter(parName,0.0);
}

LauAbsCoeffSet* LauMagPhaseCoeffSet::createClone(const TString& newName, Double_t constFactor)
{
        LauAbsCoeffSet* clone = new LauMagPhaseCoeffSet( *this, constFactor );
        clone->name( newName );
        return clone;
}