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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2007 Cristina Duminuco
 Copyright (C) 2007 Ferdinando Ametrano

 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/

 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.

/*! \file abcdatmvolcurve.hpp
    \brief Abcd-interpolated at-the-money (no-smile) interest rate vol curve

#ifndef quantlib_abcd_atm_vol_curve_hpp
#define quantlib_abcd_atm_vol_curve_hpp

#include <ql/experimental/blackatmvolcurve.hpp>
#include <ql/math/interpolation.hpp>
#include <ql/math/interpolations/abcdinterpolation.hpp>
#include <ql/quote.hpp>
#include <ql/patterns/lazyobject.hpp>

namespace QuantLib {

    //! Abcd-interpolated at-the-money (no-smile) volatility curve
    /*! blah blah
00039     class AbcdAtmVolCurve : public BlackAtmVolCurve,
                            public LazyObject {
        //! floating reference date, floating market data
        AbcdAtmVolCurve(Natural settlementDays,
                        const Calendar& cal,
                        const std::vector<Period>& optionTenors,
                        const std::vector<Handle<Quote> >& volsHandles,
                        const std::vector<bool> inclusionInInterpolationFlag 
                            = std::vector<bool>(1,true),
                        BusinessDayConvention bdc = Following,
                        const DayCounter& dc = Actual365Fixed());
        //! Returns k adjustment factors for option tenors used in interpolation
        std::vector<Real> k() const;
        //! Returns k adjustment factor at time t
        Real k(Time t) const;
        Real a() const;
        Real b() const;
        Real c() const;
        Real d() const;
        Real rmsError() const;
        Real maxError() const;
        EndCriteria::Type endCriteria() const;
        //! \name TermStructure interface
        virtual Date maxDate() const;
        //! \name LazyObject interface
        void update();
        void performCalculations() const;
        //! \name some inspectors
        const std::vector<Period>& optionTenors() const;
        const std::vector<Period>& optionTenorsInInterpolation() const;
        const std::vector<Date>& optionDates() const;
        const std::vector<Time>& optionTimes() const;
        //! \name Visitability
        virtual void accept(AcyclicVisitor&);
        //! \name BlackAtmVolCurve interface
        //! spot at-the-money variance calculation (k adjusted)
        virtual Real atmVarianceImpl(Time t) const;
        //! spot at-the-money volatility calculation (k adjusted)
        virtual Volatility atmVolImpl(Time t) const;
        void checkInputs() const;
        void initializeOptionDatesAndTimes() const;
        void initializeVolatilities();
        void registerWithMarketData();
        void interpolate();

        Size nOptionTenors_;
        std::vector<Period> optionTenors_;
        mutable std::vector<Period> actualOptionTenors_;
        mutable std::vector<Date> optionDates_;
        mutable std::vector<Time> optionTimes_;
        mutable std::vector<Time> actualOptionTimes_;
        Date evaluationDate_;

        std::vector<Handle<Quote> > volHandles_;
        mutable std::vector<Volatility> vols_;
        mutable std::vector<Volatility> actualVols_;

        mutable std::vector<bool> inclusionInInterpolation_;
        boost::shared_ptr<AbcdInterpolation> interpolation_;

    // inline

00116     inline Date AbcdAtmVolCurve::maxDate() const {
        return optionDateFromTenor(optionTenors_.back());

00121     inline Real AbcdAtmVolCurve::atmVarianceImpl(Time t) const {
        Volatility vol = atmVolImpl(t);
        return vol*vol*t;

00126     inline Volatility AbcdAtmVolCurve::atmVolImpl(Time t) const {
        return k(t) * interpolation_->operator() (t, true);

    inline const std::vector<Period>& AbcdAtmVolCurve::optionTenors() const {
         return optionTenors_;

    inline const std::vector<Period>& AbcdAtmVolCurve::optionTenorsInInterpolation() const {
        return actualOptionTenors_;
    const std::vector<Date>& AbcdAtmVolCurve::optionDates() const {
        return optionDates_;

    const std::vector<Time>& AbcdAtmVolCurve::optionTimes() const {
        return optionTimes_;

00150     std::vector<Real> AbcdAtmVolCurve::k() const {
        return interpolation_->k();
00155     Real AbcdAtmVolCurve::k(Time t) const {
        return interpolation_->k(t,actualOptionTimes_.begin(),actualOptionTimes_.end());

    inline Real AbcdAtmVolCurve::a() const {
        return interpolation_->a();

    inline Real AbcdAtmVolCurve::b() const {
        return interpolation_->b();

    inline Real AbcdAtmVolCurve::c() const {
        return interpolation_->c();

    inline Real AbcdAtmVolCurve::d() const {
        return interpolation_->d();

    inline Real AbcdAtmVolCurve::rmsError() const {
        return interpolation_->rmsError();
    inline Real AbcdAtmVolCurve::maxError() const {
        return interpolation_->maxError();


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