//-------------------------------------------------------------------------
public virtual void test_price_presentValue()
{
for (int i = 0; i < NB_STRIKES; ++i)
{
ResolvedFxVanillaOption call = CALLS[i];
ResolvedFxVanillaOptionTrade callTrade = ResolvedFxVanillaOptionTrade.builder().product(call).premium(Payment.of(EUR, 0, VAL_DATE)).build();
double computedPriceCall = PRICER.price(call, RATES_PROVIDER, VOLS);
CurrencyAmount computedCall = PRICER.presentValue(call, RATES_PROVIDER, VOLS);
double timeToExpiry = VOLS.relativeTime(EXPIRY);
FxRate forward = FX_PRICER.forwardFxRate(UNDERLYING[i], RATES_PROVIDER);
double forwardRate = forward.fxRate(CURRENCY_PAIR);
double strikeRate = call.Strike;
SmileDeltaParameters smileAtTime = VOLS.Smile.smileForExpiry(timeToExpiry);
double[] strikes = smileAtTime.strike(forwardRate).toArray();
double[] vols = smileAtTime.Volatility.toArray();
double df = RATES_PROVIDER.discountFactor(USD, PAY);
double[] weights = this.weights(forwardRate, strikeRate, strikes, timeToExpiry, vols[1]);
double expectedPriceCall = BlackFormulaRepository.price(forwardRate, strikeRate, timeToExpiry, vols[1], true);
for (int j = 0; j < 3; ++j)
{
expectedPriceCall += weights[j] * (BlackFormulaRepository.price(forwardRate, strikes[j], timeToExpiry, vols[j], true) - BlackFormulaRepository.price(forwardRate, strikes[j], timeToExpiry, vols[1], true));
}
expectedPriceCall *= df;
assertEquals(computedPriceCall, expectedPriceCall, TOL);
assertEquals(computedCall.Amount, expectedPriceCall * NOTIONAL, TOL * NOTIONAL);
// test against trade pricer
assertEquals(computedCall, TRADE_PRICER.presentValue(callTrade, RATES_PROVIDER, VOLS).getAmount(USD));
}
}
//-------------------------------------------------------------------------
public virtual void test_volatility()
{
for (int i = 0; i < NB_EXPIRY; i++)
{
double expiryTime = VOLS.relativeTime(TEST_EXPIRY[i]);
for (int j = 0; j < NB_STRIKE; ++j)
{
double volExpected = SMILE_TERM.volatility(expiryTime, TEST_STRIKE[j], FORWARD[i]);
double volComputed = VOLS.volatility(CURRENCY_PAIR, TEST_EXPIRY[i], TEST_STRIKE[j], FORWARD[i]);
assertEquals(volComputed, volExpected, TOLERANCE);
}
}
}
//-------------------------------------------------------------------------
/// <summary>
/// Calculates the price of the foreign exchange vanilla option product.
/// <para>
/// The price of the product is the value on the valuation date for one unit of the base currency
/// and is expressed in the counter currency. The price does not take into account the long/short flag.
/// See <seealso cref="#presentValue"/> for scaling and currency.
///
/// </para>
/// </summary>
/// <param name="option"> the option product </param>
/// <param name="ratesProvider"> the rates provider </param>
/// <param name="volatilities"> the Black volatility provider </param>
/// <returns> the price of the product </returns>
public virtual double price(ResolvedFxVanillaOption option, RatesProvider ratesProvider, BlackFxOptionSmileVolatilities volatilities)
{
validate(ratesProvider, volatilities);
double timeToExpiry = volatilities.relativeTime(option.Expiry);
if (timeToExpiry <= 0d)
{
return(0d);
}
ResolvedFxSingle underlyingFx = option.Underlying;
Currency ccyCounter = option.CounterCurrency;
double df = ratesProvider.discountFactor(ccyCounter, underlyingFx.PaymentDate);
FxRate forward = fxPricer.forwardFxRate(underlyingFx, ratesProvider);
CurrencyPair currencyPair = underlyingFx.CurrencyPair;
double forwardRate = forward.fxRate(currencyPair);
double strikeRate = option.Strike;
bool isCall = option.PutCall.Call;
SmileDeltaParameters smileAtTime = volatilities.Smile.smileForExpiry(timeToExpiry);
double[] strikes = smileAtTime.strike(forwardRate).toArray();
double[] vols = smileAtTime.Volatility.toArray();
double volAtm = vols[1];
double[] x = vannaVolgaWeights(forwardRate, strikeRate, timeToExpiry, volAtm, strikes);
double priceFwd = BlackFormulaRepository.price(forwardRate, strikeRate, timeToExpiry, volAtm, isCall);
for (int i = 0; i < 3; i += 2)
{
double priceFwdAtm = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, volAtm, isCall);
double priceFwdSmile = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, vols[i], isCall);
priceFwd += x[i] * (priceFwdSmile - priceFwdAtm);
}
return(df * priceFwd);
}
/// <summary>
/// Calculates the currency exposure of the foreign exchange vanilla option product.
/// </summary>
/// <param name="option"> the option product </param>
/// <param name="ratesProvider"> the rates provider </param>
/// <param name="volatilities"> the Black volatility provider </param>
/// <returns> the currency exposure </returns>
public virtual MultiCurrencyAmount currencyExposure(ResolvedFxVanillaOption option, RatesProvider ratesProvider, BlackFxOptionSmileVolatilities volatilities)
{
validate(ratesProvider, volatilities);
double timeToExpiry = volatilities.relativeTime(option.Expiry);
if (timeToExpiry <= 0d)
{
return(MultiCurrencyAmount.empty());
}
ResolvedFxSingle underlyingFx = option.Underlying;
Currency ccyCounter = option.CounterCurrency;
double df = ratesProvider.discountFactor(ccyCounter, underlyingFx.PaymentDate);
FxRate forward = fxPricer.forwardFxRate(underlyingFx, ratesProvider);
CurrencyPair currencyPair = underlyingFx.CurrencyPair;
double spot = ratesProvider.fxRate(currencyPair);
double forwardRate = forward.fxRate(currencyPair);
double fwdRateSpotSensitivity = fxPricer.forwardFxRateSpotSensitivity(option.PutCall.Call ? underlyingFx : underlyingFx.inverse(), ratesProvider);
double strikeRate = option.Strike;
bool isCall = option.PutCall.Call;
SmileDeltaParameters smileAtTime = volatilities.Smile.smileForExpiry(timeToExpiry);
double[] strikes = smileAtTime.strike(forwardRate).toArray();
double[] vols = smileAtTime.Volatility.toArray();
double volAtm = vols[1];
double[] x = vannaVolgaWeights(forwardRate, strikeRate, timeToExpiry, volAtm, strikes);
double priceFwd = BlackFormulaRepository.price(forwardRate, strikeRate, timeToExpiry, volAtm, isCall);
double deltaFwd = BlackFormulaRepository.delta(forwardRate, strikeRate, timeToExpiry, volAtm, isCall);
for (int i = 0; i < 3; i += 2)
{
double priceFwdAtm = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, volAtm, isCall);
double priceFwdSmile = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, vols[i], isCall);
priceFwd += x[i] * (priceFwdSmile - priceFwdAtm);
double deltaFwdAtm = BlackFormulaRepository.delta(forwardRate, strikes[i], timeToExpiry, volAtm, isCall);
double deltaFwdSmile = BlackFormulaRepository.delta(forwardRate, strikes[i], timeToExpiry, vols[i], isCall);
deltaFwd += x[i] * (deltaFwdSmile - deltaFwdAtm);
}
double price = df * priceFwd;
double delta = df * deltaFwd * fwdRateSpotSensitivity;
double signedNotional = this.signedNotional(option);
CurrencyAmount domestic = CurrencyAmount.of(currencyPair.Counter, (price - delta * spot) * signedNotional);
CurrencyAmount foreign = CurrencyAmount.of(currencyPair.Base, delta * signedNotional);
return(MultiCurrencyAmount.of(domestic, foreign));
}
//-------------------------------------------------------------------------
/// <summary>
/// Calculates the present value sensitivity of the foreign exchange vanilla option product.
/// <para>
/// The present value sensitivity of the product is the sensitivity of <seealso cref="#presentValue"/> to
/// the underlying curves.
/// </para>
/// <para>
/// The implied strikes and weights are fixed in this sensitivity computation.
///
/// </para>
/// </summary>
/// <param name="option"> the option product </param>
/// <param name="ratesProvider"> the rates provider </param>
/// <param name="volatilities"> the Black volatility provider </param>
/// <returns> the present value curve sensitivity of the product </returns>
public virtual PointSensitivityBuilder presentValueSensitivityRatesStickyStrike(ResolvedFxVanillaOption option, RatesProvider ratesProvider, BlackFxOptionSmileVolatilities volatilities)
{
validate(ratesProvider, volatilities);
double timeToExpiry = volatilities.relativeTime(option.Expiry);
if (timeToExpiry <= 0d)
{
return(PointSensitivityBuilder.none());
}
ResolvedFxSingle underlyingFx = option.Underlying;
Currency ccyCounter = option.CounterCurrency;
double df = ratesProvider.discountFactor(ccyCounter, underlyingFx.PaymentDate);
FxRate forward = fxPricer.forwardFxRate(underlyingFx, ratesProvider);
CurrencyPair currencyPair = underlyingFx.CurrencyPair;
double forwardRate = forward.fxRate(currencyPair);
double strikeRate = option.Strike;
bool isCall = option.PutCall.Call;
SmileDeltaParameters smileAtTime = volatilities.Smile.smileForExpiry(timeToExpiry);
double[] strikes = smileAtTime.strike(forwardRate).toArray();
double[] vols = smileAtTime.Volatility.toArray();
double volAtm = vols[1];
double[] x = vannaVolgaWeights(forwardRate, strikeRate, timeToExpiry, volAtm, strikes);
double priceFwd = BlackFormulaRepository.price(forwardRate, strikeRate, timeToExpiry, volAtm, isCall);
double deltaFwd = BlackFormulaRepository.delta(forwardRate, strikeRate, timeToExpiry, volAtm, isCall);
for (int i = 0; i < 3; i += 2)
{
double priceFwdAtm = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, volAtm, isCall);
double priceFwdSmile = BlackFormulaRepository.price(forwardRate, strikes[i], timeToExpiry, vols[i], isCall);
priceFwd += x[i] * (priceFwdSmile - priceFwdAtm);
double deltaFwdAtm = BlackFormulaRepository.delta(forwardRate, strikes[i], timeToExpiry, volAtm, isCall);
double deltaFwdSmile = BlackFormulaRepository.delta(forwardRate, strikes[i], timeToExpiry, vols[i], isCall);
deltaFwd += x[i] * (deltaFwdSmile - deltaFwdAtm);
}
double signedNotional = this.signedNotional(option);
PointSensitivityBuilder dfSensi = ratesProvider.discountFactors(ccyCounter).zeroRatePointSensitivity(underlyingFx.PaymentDate).multipliedBy(priceFwd * signedNotional);
PointSensitivityBuilder fwdSensi = fxPricer.forwardFxRatePointSensitivity(option.PutCall.Call ? underlyingFx : underlyingFx.inverse(), ratesProvider).multipliedBy(df * deltaFwd * signedNotional);
return(dfSensi.combinedWith(fwdSensi));
}
/// <summary>
/// Computes the present value sensitivity to the black volatilities used in the pricing.
/// <para>
/// The implied strikes and weights are fixed in this sensitivity computation.
///
/// </para>
/// </summary>
/// <param name="option"> the option product </param>
/// <param name="ratesProvider"> the rates provider </param>
/// <param name="volatilities"> the Black volatility provider </param>
/// <returns> the present value sensitivity </returns>
public virtual PointSensitivityBuilder presentValueSensitivityModelParamsVolatility(ResolvedFxVanillaOption option, RatesProvider ratesProvider, BlackFxOptionSmileVolatilities volatilities)
{
validate(ratesProvider, volatilities);
double timeToExpiry = volatilities.relativeTime(option.Expiry);
if (timeToExpiry <= 0d)
{
return(PointSensitivityBuilder.none());
}
ResolvedFxSingle underlyingFx = option.Underlying;
Currency ccyCounter = option.CounterCurrency;
double df = ratesProvider.discountFactor(ccyCounter, underlyingFx.PaymentDate);
FxRate forward = fxPricer.forwardFxRate(underlyingFx, ratesProvider);
CurrencyPair currencyPair = underlyingFx.CurrencyPair;
double forwardRate = forward.fxRate(currencyPair);
double strikeRate = option.Strike;
SmileDeltaParameters smileAtTime = volatilities.Smile.smileForExpiry(timeToExpiry);
double[] strikes = smileAtTime.strike(forwardRate).toArray();
double[] vols = smileAtTime.Volatility.toArray();
double volAtm = vols[1];
double[] x = vannaVolgaWeights(forwardRate, strikeRate, timeToExpiry, volAtm, strikes);
double vegaAtm = BlackFormulaRepository.vega(forwardRate, strikeRate, timeToExpiry, volAtm);
double signedNotional = this.signedNotional(option);
PointSensitivityBuilder sensiSmile = PointSensitivityBuilder.none();
for (int i = 0; i < 3; i += 2)
{
double vegaFwdAtm = BlackFormulaRepository.vega(forwardRate, strikes[i], timeToExpiry, volAtm);
vegaAtm -= x[i] * vegaFwdAtm;
double vegaFwdSmile = BlackFormulaRepository.vega(forwardRate, strikes[i], timeToExpiry, vols[i]);
sensiSmile = sensiSmile.combinedWith(FxOptionSensitivity.of(volatilities.Name, currencyPair, timeToExpiry, strikes[i], forwardRate, ccyCounter, df * signedNotional * x[i] * vegaFwdSmile));
}
FxOptionSensitivity sensiAtm = FxOptionSensitivity.of(volatilities.Name, currencyPair, timeToExpiry, strikes[1], forwardRate, ccyCounter, df * signedNotional * vegaAtm);
return(sensiAtm.combinedWith(sensiSmile));
}
//-------------------------------------------------------------------------
public virtual void test_price_presentValue()
{
double priceCallOtm = PRICER.price(CALL_OTM, RATES_PROVIDER, VOLS);
CurrencyAmount pvCallOtm = PRICER.presentValue(CALL_OTM, RATES_PROVIDER, VOLS);
double pricePutOtm = PRICER.price(PUT_OTM, RATES_PROVIDER, VOLS);
CurrencyAmount pvPutOtm = PRICER.presentValue(PUT_OTM, RATES_PROVIDER, VOLS);
double timeToExpiry = VOLS.relativeTime(EXPIRY);
double df = RATES_PROVIDER.discountFactor(USD, PAYMENT_DATE);
double forward = PRICER.DiscountingFxSingleProductPricer.forwardFxRate(FX_PRODUCT_HIGH, RATES_PROVIDER).fxRate(CURRENCY_PAIR);
double volHigh = SMILE_TERM.volatility(timeToExpiry, STRIKE_RATE_HIGH, forward);
double volLow = SMILE_TERM.volatility(timeToExpiry, STRIKE_RATE_LOW, forward);
double expectedPriceCallOtm = df * BlackFormulaRepository.price(forward, STRIKE_RATE_HIGH, timeToExpiry, volHigh, true);
double expectedPricePutOtm = df * BlackFormulaRepository.price(forward, STRIKE_RATE_LOW, timeToExpiry, volLow, false);
double expectedPvCallOtm = -NOTIONAL *df *BlackFormulaRepository.price(forward, STRIKE_RATE_HIGH, timeToExpiry, volHigh, true);
double expectedPvPutOtm = -NOTIONAL *df *BlackFormulaRepository.price(forward, STRIKE_RATE_LOW, timeToExpiry, volLow, false);
assertEquals(priceCallOtm, expectedPriceCallOtm, TOL);
assertEquals(pvCallOtm.Currency, USD);
assertEquals(pvCallOtm.Amount, expectedPvCallOtm, NOTIONAL * TOL);
assertEquals(pricePutOtm, expectedPricePutOtm, TOL);
assertEquals(pvPutOtm.Currency, USD);
assertEquals(pvPutOtm.Amount, expectedPvPutOtm, NOTIONAL * TOL);
}
//-------------------------------------------------------------------------
// bumping a node point at (nodeExpiry, nodeDelta)
private double nodeSensitivity(BlackFxOptionSmileVolatilities provider, CurrencyPair pair, ZonedDateTime expiry, double strike, double forward, double nodeExpiry, double nodeDelta)
{
double strikeMod = provider.CurrencyPair.Equals(pair) ? strike : 1.0 / strike;
double forwardMod = provider.CurrencyPair.Equals(pair) ? forward : 1.0 / forward;
InterpolatedStrikeSmileDeltaTermStructure smileTerm = (InterpolatedStrikeSmileDeltaTermStructure)provider.Smile;
double[] times = smileTerm.Expiries.toArray();
int nTimes = times.Length;
SmileDeltaParameters[] volTermUp = new SmileDeltaParameters[nTimes];
SmileDeltaParameters[] volTermDw = new SmileDeltaParameters[nTimes];
int deltaIndex = -1;
for (int i = 0; i < nTimes; ++i)
{
DoubleArray deltas = smileTerm.VolatilityTerm.get(i).Delta;
int nDeltas = deltas.size();
int nDeltasTotal = 2 * nDeltas + 1;
double[] deltasTotal = new double[nDeltasTotal];
deltasTotal[nDeltas] = 0.5d;
for (int j = 0; j < nDeltas; ++j)
{
deltasTotal[j] = 1d - deltas.get(j);
deltasTotal[2 * nDeltas - j] = deltas.get(j);
}
double[] volsUp = smileTerm.VolatilityTerm.get(i).Volatility.toArray();
double[] volsDw = smileTerm.VolatilityTerm.get(i).Volatility.toArray();
if (Math.Abs(times[i] - nodeExpiry) < TOLERANCE)
{
for (int j = 0; j < nDeltasTotal; ++j)
{
if (Math.Abs(deltasTotal[j] - nodeDelta) < TOLERANCE)
{
deltaIndex = j;
volsUp[j] += EPS;
volsDw[j] -= EPS;
}
}
}
volTermUp[i] = SmileDeltaParameters.of(times[i], deltas, DoubleArray.copyOf(volsUp));
volTermDw[i] = SmileDeltaParameters.of(times[i], deltas, DoubleArray.copyOf(volsDw));
}
InterpolatedStrikeSmileDeltaTermStructure smileTermUp = InterpolatedStrikeSmileDeltaTermStructure.of(ImmutableList.copyOf(volTermUp), ACT_365F);
InterpolatedStrikeSmileDeltaTermStructure smileTermDw = InterpolatedStrikeSmileDeltaTermStructure.of(ImmutableList.copyOf(volTermDw), ACT_365F);
BlackFxOptionSmileVolatilities provUp = BlackFxOptionSmileVolatilities.of(NAME, CURRENCY_PAIR, VAL_DATE_TIME, smileTermUp);
BlackFxOptionSmileVolatilities provDw = BlackFxOptionSmileVolatilities.of(NAME, CURRENCY_PAIR, VAL_DATE_TIME, smileTermDw);
double volUp = provUp.volatility(pair, expiry, strike, forward);
double volDw = provDw.volatility(pair, expiry, strike, forward);
double totalSensi = 0.5 * (volUp - volDw) / EPS;
double expiryTime = provider.relativeTime(expiry);
SmileDeltaParameters singleSmile = smileTerm.smileForExpiry(expiryTime);
double[] strikesUp = singleSmile.strike(forwardMod).toArray();
double[] strikesDw = strikesUp.Clone();
double[] vols = singleSmile.Volatility.toArray();
strikesUp[deltaIndex] += EPS;
strikesDw[deltaIndex] -= EPS;
double volStrikeUp = LINEAR.bind(DoubleArray.ofUnsafe(strikesUp), DoubleArray.ofUnsafe(vols), FLAT, FLAT).interpolate(strikeMod);
double volStrikeDw = LINEAR.bind(DoubleArray.ofUnsafe(strikesDw), DoubleArray.ofUnsafe(vols), FLAT, FLAT).interpolate(strikeMod);
double sensiStrike = 0.5 * (volStrikeUp - volStrikeDw) / EPS;
SmileDeltaParameters singleSmileUp = smileTermUp.smileForExpiry(expiryTime);
double strikeUp = singleSmileUp.strike(forwardMod).get(deltaIndex);
SmileDeltaParameters singleSmileDw = smileTermDw.smileForExpiry(expiryTime);
double strikeDw = singleSmileDw.strike(forwardMod).get(deltaIndex);
double sensiVol = 0.5 * (strikeUp - strikeDw) / EPS;
return(totalSensi - sensiStrike * sensiVol);
}
