public override void calculate()
{
Utils.QL_REQUIRE(arguments_.settlementType == Settlement.Type.Physical, () =>
"cash-settled swaptions not priced with G2 engine");
// adjust the fixed rate of the swap for the spread on the
// floating leg (which is not taken into account by the
// model)
VanillaSwap swap = arguments_.swap;
swap.setPricingEngine(new DiscountingSwapEngine(model_.link.termStructure()));
double correction = swap.spread *
Math.Abs(swap.floatingLegBPS() / swap.fixedLegBPS());
double fixedRate = swap.fixedRate - correction;
results_.value = model_.link.swaption(arguments_, fixedRate,
range_, intervals_);
}
public override void calculate()
{
Utils.QL_REQUIRE(arguments_.settlementMethod != Settlement.Method.ParYieldCurve, () =>
"cash-settled (ParYieldCurve) swaptions not priced with Lfm engine");
VanillaSwap swap = arguments_.swap;
IPricingEngine pe = new DiscountingSwapEngine(discountCurve_);
swap.setPricingEngine(pe);
double correction = swap.spread *
Math.Abs(swap.floatingLegBPS() / swap.fixedLegBPS());
double fixedRate = swap.fixedRate - correction;
double fairRate = swap.fairRate() - correction;
SwaptionVolatilityMatrix volatility =
model_.link.getSwaptionVolatilityMatrix();
Date referenceDate = volatility.referenceDate();
DayCounter dayCounter = volatility.dayCounter();
double exercise = dayCounter.yearFraction(referenceDate,
arguments_.exercise.date(0));
double swapLength =
dayCounter.yearFraction(referenceDate,
arguments_.fixedPayDates.Last())
- dayCounter.yearFraction(referenceDate,
arguments_.fixedResetDates[0]);
Option.Type w = arguments_.type == VanillaSwap.Type.Payer ?
Option.Type.Call : Option.Type.Put;
double vol = volatility.volatility(exercise, swapLength,
fairRate, true);
results_.value = (swap.fixedLegBPS() / Const.BASIS_POINT) *
Utils.blackFormula(w, fixedRate, fairRate, vol * Math.Sqrt(exercise));
}
public override void calculate()
{
Date exerciseDate = arguments_.exercise.date(0);
// the part of the swap preceding exerciseDate should be truncated
// to avoid taking into account unwanted cashflows
// for the moment we add a check avoiding this situation
VanillaSwap swap = arguments_.swap;
double strike = swap.fixedRate;
List <CashFlow> fixedLeg = swap.fixedLeg();
FixedRateCoupon firstCoupon = fixedLeg[0] as FixedRateCoupon;
Utils.QL_REQUIRE(firstCoupon != null, () => "wrong coupon type");
Utils.QL_REQUIRE(firstCoupon.accrualStartDate() >= exerciseDate,
() => "swap start (" + firstCoupon.accrualStartDate() + ") before exercise date ("
+ exerciseDate + ") not supported in Black swaption engine");
// using the forecasting curve
swap.setPricingEngine(new DiscountingSwapEngine(swap.iborIndex().forwardingTermStructure()));
double atmForward = swap.fairRate();
// Volatilities are quoted for zero-spreaded swaps.
// Therefore, any spread on the floating leg must be removed
// with a corresponding correction on the fixed leg.
if (swap.spread.IsNotEqual(0.0))
{
double correction = swap.spread * Math.Abs(swap.floatingLegBPS() / swap.fixedLegBPS());
strike -= correction;
atmForward -= correction;
results_.additionalResults["spreadCorrection"] = correction;
}
else
{
results_.additionalResults["spreadCorrection"] = 0.0;
}
results_.additionalResults["strike"] = strike;
results_.additionalResults["atmForward"] = atmForward;
// using the discounting curve
swap.setPricingEngine(new DiscountingSwapEngine(discountCurve_, false));
double annuity = 0;
if (arguments_.settlementType == Settlement.Type.Physical ||
(arguments_.settlementType == Settlement.Type.Cash &&
arguments_.settlementMethod == Settlement.Method.CollateralizedCashPrice))
{
annuity = Math.Abs(swap.fixedLegBPS()) / Const.BASIS_POINT;
}
else if (arguments_.settlementType == Settlement.Type.Cash &&
arguments_.settlementMethod == Settlement.Method.ParYieldCurve)
{
DayCounter dayCount = firstCoupon.dayCounter();
// we assume that the cash settlement date is equal
// to the swap start date
Date discountDate = model_ == CashAnnuityModel.DiscountCurve
? firstCoupon.accrualStartDate()
: discountCurve_.link.referenceDate();
double fixedLegCashBPS =
CashFlows.bps(fixedLeg,
new InterestRate(atmForward, dayCount, Compounding.Compounded, Frequency.Annual), false,
discountDate);
annuity = Math.Abs(fixedLegCashBPS / Const.BASIS_POINT) * discountCurve_.link.discount(discountDate);
}
else
{
Utils.QL_FAIL("unknown settlement type");
}
results_.additionalResults["annuity"] = annuity;
double swapLength = vol_.link.swapLength(swap.floatingSchedule().dates().First(),
swap.floatingSchedule().dates().Last());
results_.additionalResults["swapLength"] = swapLength;
double variance = vol_.link.blackVariance(exerciseDate,
swapLength,
strike);
double displacement = displacement_ == null
? vol_.link.shift(exerciseDate, swapLength)
: Convert.ToDouble(displacement_);
double stdDev = Math.Sqrt(variance);
results_.additionalResults["stdDev"] = stdDev;
Option.Type w = (arguments_.type == VanillaSwap.Type.Payer) ? Option.Type.Call : Option.Type.Put;
results_.value = new Spec().value(w, strike, atmForward, stdDev, annuity, displacement);
double exerciseTime = vol_.link.timeFromReference(exerciseDate);
results_.additionalResults["vega"] =
new Spec().vega(strike, atmForward, stdDev, exerciseTime, annuity, displacement);
}