QuantLib: a free/open-source library for quantitative finance
fully annotated source code - version 1.34
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multistepratchet.cpp
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1/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2
3/*
4 Copyright (C) 2006 Giorgio Facchinetti
5
6 This file is part of QuantLib, a free-software/open-source library
7 for financial quantitative analysts and developers - http://quantlib.org/
8
9 QuantLib is free software: you can redistribute it and/or modify it
10 under the terms of the QuantLib license. You should have received a
11 copy of the license along with this program; if not, please email
12 <quantlib-dev@lists.sf.net>. The license is also available online at
13 <http://quantlib.org/license.shtml>.
14
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the license for more details.
18*/
19
23#include <cmath>
24#include <utility>
25
26namespace QuantLib {
27
28 MultiStepRatchet::MultiStepRatchet(const std::vector<Time>& rateTimes,
29 std::vector<Real> accruals,
30 const std::vector<Time>& paymentTimes,
31 Real gearingOfFloor,
32 Real gearingOfFixing,
33 Rate spreadOfFloor,
34 Rate spreadOfFixing,
35 Real initialFloor,
36 bool payer)
37 : MultiProductMultiStep(rateTimes), accruals_(std::move(accruals)), paymentTimes_(paymentTimes),
38 gearingOfFloor_(gearingOfFloor), gearingOfFixing_(gearingOfFixing),
39 spreadOfFloor_(spreadOfFloor), spreadOfFixing_(spreadOfFixing),
40 multiplier_(payer ? 1.0 : -1.0), lastIndex_(rateTimes.size() - 1),
41 initialFloor_(initialFloor) {
42 checkIncreasingTimes(paymentTimes);
43 }
44
46 const CurveState& currentState,
47 std::vector<Size>& numberCashFlowsThisStep,
48 std::vector<std::vector<MarketModelMultiProduct::CashFlow> >&
49 genCashFlows)
50 {
51 Rate liborRate = currentState.forwardRate(currentIndex_);
52 Real currentCoupon = std::max(gearingOfFloor_* floor_ + spreadOfFloor_,
54
55 genCashFlows[0][0].timeIndex = currentIndex_;
56 genCashFlows[0][0].amount =
57 multiplier_* accruals_[currentIndex_]*currentCoupon;
58
59 //floor_ = liborRate; //StepRatchet
60 floor_ = currentCoupon; //FullRatchet
61 numberCashFlowsThisStep[0] = 1;
62
64
65 return (currentIndex_ == lastIndex_);
66 }
67
68 std::unique_ptr<MarketModelMultiProduct>
70 return std::unique_ptr<MarketModelMultiProduct>(new MultiStepRatchet(*this));
71 }
72
73}
74
Curve state for market-model simulations
Definition: curvestate.hpp:41
virtual Rate forwardRate(Size i) const =0
Multiple-step market-model product.
std::unique_ptr< MarketModelMultiProduct > clone() const override
returns a newly-allocated copy of itself
bool nextTimeStep(const CurveState &currentState, std::vector< Size > &numberCashFlowsThisStep, std::vector< std::vector< CashFlow > > &cashFlowsGenerated) override
return value indicates whether path is finished, TRUE means done
MultiStepRatchet(const std::vector< Time > &rateTimes, std::vector< Real > accruals, const std::vector< Time > &paymentTimes, Real gearingOfFloor, Real gearingOfFixing, Rate spreadOfFloor, Rate spreadOfFixing, Real initialFloor, bool payer=true)
std::vector< Real > accruals_
QL_REAL Real
real number
Definition: types.hpp:50
Real Rate
interest rates
Definition: types.hpp:70
Definition: any.hpp:35
void checkIncreasingTimes(const std::vector< Time > &times)
check for strictly increasing times, first time greater than zero
Definition: utilities.cpp:92
STL namespace.