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

 Copyright (C) 2005 Klaus Spanderen

 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 hestonprocess.hpp
    \brief Heston stochastic process

#ifndef quantlib_heston_process_hpp
#define quantlib_heston_process_hpp

#include <ql/stochasticprocess.hpp>
#include <ql/yieldtermstructure.hpp>
#include <ql/quote.hpp>

namespace QuantLib {

    //! Square-root stochastic-volatility Heston process
    /*! This class describes the square root stochastic volatility
        process governed by
        dS(t, S)  &=& \mu S dt + \sqrt{v} S dW_1 \\
        dv(t, S)  &=& \kappa (\theta - v) dt + \sigma \sqrt{v} dW_2 \\
        dW_1 dW_2 &=& \rho dt
00044     class HestonProcess : public StochasticProcess {
        HestonProcess(const Handle<YieldTermStructure>& riskFreeRate,
                      const Handle<YieldTermStructure>& dividendYield,
                      const Handle<Quote>& s0,
                      Real v0, Real kappa,
                      Real theta, Real sigma, Real rho);

        Size size() const;
        Disposable<Array> initialValues() const;
        Disposable<Array> drift(Time t, const Array& x) const;
        Disposable<Matrix> diffusion(Time t, const Array& x) const;
        Disposable<Array> apply(const Array& x0, const Array& dx) const;

        Real s0()    const;
        Real v0()    const;
        Real rho()   const;
        Real kappa() const;
        Real theta() const;
        Real sigma() const;

        const boost::shared_ptr<YieldTermStructure>& dividendYield() const;
        const boost::shared_ptr<YieldTermStructure>& riskFreeRate() const;

        Time time(const Date&) const;
        Handle<YieldTermStructure> riskFreeRate_, dividendYield_;
        Handle<Quote> s0_;
        Real v0_, kappa_, theta_, sigma_, rho_;



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