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

 Copyright (C) 2005 Joseph Wang

 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.

#include <ql/PricingEngines/Vanilla/fddividendengine.hpp>
#include <ql/Math/cubicspline.hpp>
#include <ql/FiniteDifferences/valueatcenter.hpp>

namespace QuantLib {

    void FDDividendEngine::initializeControlVariate() const{
        Real riskless = 0.0;
        for (Size i=0; i<dividends_.size(); i++)
            riskless += dividends_[i]*std::exp(-riskFreeRate_*dates_[i]);
        Real spot = underlying_ + addElements(dividends_) - riskless;
        DiscountFactor discount = std::exp(-riskFreeRate_*residualTime_);
        DiscountFactor qDiscount = std::exp(-dividendYield_*residualTime_);
        Real forward = spot*qDiscount/discount;
        Real variance = volatility_*volatility_*residualTime_;
        boost::shared_ptr<StrikedTypePayoff> payoff(
                                             new PlainVanillaPayoff(payoff_));
        // theta, rho, and dividend rho should be corrected. However,
        // the control variate machinery won't use them.
        analytic_ = boost::shared_ptr<BlackFormula>(
                       new BlackFormula(forward, discount, variance, payoff));

    void FDDividendEngine::executeIntermediateStep(Size step) const{

        Real newSMin = sMin_ + getDividend(step);
        Real newSMax = sMax_ + getDividend(step);

        setGridLimits(center_ + getDividend(step), getResidualTime());
        if (sMin_ < newSMin) {
            sMin_ = newSMin;
            sMax_ = center_/(sMin_/center_);
        if (sMax_ > newSMax) {
            sMax_ = newSMax;
            sMin_ = center_/(sMax_/center_);
        Array oldGrid = grid_ + getDividend(step);

        // This operation was faster than the obvious:
        //     movePricesBeforeExDiv(initialPrices_, grid_, oldGrid);

        movePricesBeforeExDiv(prices_, grid_, oldGrid);
        stepCondition_ -> applyTo(prices_, getDividendTime(step));

    void FDDividendEngine::movePricesBeforeExDiv(Array& prices,
                                                 const Array& newGrid,
                                                 const Array& oldGrid) const {
        Size j, gridSize = oldGrid.size();

        std::vector<Real> logOldGrid(0);
        std::vector<Real> tmpPrices(0);

        for (j = 0; j<gridSize; j++) {
            Real p = prices[j];
            Real g = oldGrid[j];
            if (g > 0) {

        NaturalCubicSpline priceSpline(logOldGrid.begin(), logOldGrid.end(),
        for (j = 0; j < gridSize; j++) {
            prices[j] = priceSpline(std::log(newGrid[j]), true);


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