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

 Copyright (C) 2008 Frank Hövermann

 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/experimental/volatility/extendedblackvariancesurface.hpp>
#include <ql/math/interpolations/bilinearinterpolation.hpp>

namespace QuantLib {

                          const Date& referenceDate,
                          const Calendar& calendar,
                          const std::vector<Date>& dates,
                          const std::vector<Real>& strikes,
                          const std::vector<Handle<Quote> >& volatilities,
                          const DayCounter& dayCounter,
                          ExtendedBlackVarianceSurface::Extrapolation lowerEx,
                          ExtendedBlackVarianceSurface::Extrapolation upperEx)
    : BlackVarianceTermStructure(referenceDate, calendar),
      dayCounter_(dayCounter), maxDate_(dates.back()),
      volatilities_(volatilities), strikes_(strikes),
      lowerExtrapolation_(lowerEx), upperExtrapolation_(upperEx) {

                   "size mismatch between date vector and vol matrix columns "
                   "and/or between money-strike vector and vol matrix rows");

        QL_REQUIRE(dates[0] > referenceDate,
                   "cannot have dates_[0] <= referenceDate_");

        times_ = std::vector<Time>(dates.size()+1);
        times_[0] = 0.0;

        for (Size j=1; j<=dates.size(); j++) {
            times_[j] = timeFromReference(dates[j-1]);
                       "dates must be sorted unique");

        variances_ = Matrix(strikes_.size(), dates.size()+1);


        for (Size j = 0; j < volatilities_.size(); j++)


    void ExtendedBlackVarianceSurface::setVariances() {

        for (Size i=0; i<times_.size()+1; i++) {
            variances_[0][i] = 0.0;
        for (Size j=1; j<=times_.size(); j++) {
            for (Size i=0; i<strikes_.size(); i++) {
                Volatility sigma = volatilities_[i*times_.size()+j-1]->value();
                variances_[i][j] = times_[j] * sigma * sigma;
                           "variance must be non-decreasing");

00081     void ExtendedBlackVarianceSurface::update() {

00087     Real ExtendedBlackVarianceSurface::blackVarianceImpl(Time t,
                                                         Real strike) const {

        if (t==0.0) return 0.0;

        // enforce constant extrapolation when required
        if (strike < strikes_.front()
            && lowerExtrapolation_ == ConstantExtrapolation)
            strike = strikes_.front();
        if (strike > strikes_.back()
            && upperExtrapolation_ == ConstantExtrapolation)
            strike = strikes_.back();

        if (t<=times_.back())
            return varianceSurface_(t, strike, true);
        else // t>times_.back() || extrapolate
            return varianceSurface_(times_.back(), strike, true) *


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