public IPvModel Rebuild(IAssetFxModel newVanillaModel, Portfolio portfolio)
{
var m = newVanillaModel.Clone();
m.AttachPortfolio(portfolio);
return(m);
}
public static IAssetFxModel FxSpotShift(Currency ccy, double shiftSize, IAssetFxModel model)
{
var o = model.Clone();
var spot = model.FundingModel.FxMatrix.GetSpotRate(ccy);
o.FundingModel.FxMatrix.SpotRates[ccy] = spot + shiftSize;
return(o);
}
public static IAssetFxModel FxSpotShift(FxPair pair, double shiftSize, IAssetFxModel model)
{
var o = model.Clone();
if (pair.Domestic == model.FundingModel.FxMatrix.BaseCurrency)
{
var spot = model.FundingModel.FxMatrix.GetSpotRate(pair.Foreign);
o.FundingModel.FxMatrix.SpotRates[pair.Foreign] = spot + shiftSize;
}
else if (pair.Foreign == model.FundingModel.FxMatrix.BaseCurrency)
{
var spot = model.FundingModel.FxMatrix.GetSpotRate(pair.Domestic);
o.FundingModel.FxMatrix.SpotRates[pair.Domestic] = 1 / (1 / spot + shiftSize);
}
else
{
throw new Exception("Shifted FX pair must contain base currency of model");
}
return(o);
}
public void Process()
{
var currentFixingDate = _assetFxModel.BuildDate;
while (currentFixingDate <= _endDate)
{
currentFixingDate = currentFixingDate.AddDays(1);
_assetFxModel = _assetFxModel.RollModel(currentFixingDate, _currencyProvider);
}
ParallelUtils.Instance.For(0, _calculationDates.Length, 1, i =>
{
var d = _calculationDates[i];
var epe = _epeValues[i];
var newModel = _assetFxModel.Clone();
newModel.OverrideBuildDate(d);
var ead = _portfolio.SaCcrEAD(epe, newModel, _reportingCurrency, _assetIdToGroupMap);
var capital = _counterpartyRiskWeight * ead;
if (!_ead.ContainsKey(d))
{
lock (_threadLock)
{
if (!_ead.ContainsKey(d))
{
_ead.Add(d, 0.0);
}
}
}
if (double.IsNaN(capital) || double.IsInfinity(capital))
{
throw new Exception("Invalid capital generated");
}
lock (_threadLock)
{
_ead[d] += capital;
}
}).Wait();
}
public static IAssetFxModel AssetCurveShift(string assetId, double shiftSize, IAssetFxModel model)
{
var o = model.Clone();
var curve = model.GetPriceCurve(assetId);
switch (curve)
{
case PriceCurve pc:
var npc = new PriceCurve(pc.BuildDate, pc.PillarDates, pc.Prices.Select(p => p + shiftSize).ToArray(), pc.CurveType, pc.CurrencyProvider, pc.PillarLabels)
{
AssetId = pc.AssetId,
Name = pc.Name,
CollateralSpec = pc.CollateralSpec,
Currency = pc.Currency,
};
o.AddPriceCurve(assetId, npc);
break;
default:
throw new Exception("Unable to mutate curve type");
}
return(o);
}
public static double[] EPE_Approx(DateTime[] exposureDates, Portfolio portfolio, IAssetFxModel model, Currency reportingCurrency, ICurrencyProvider currencyProvider, Dictionary <DateTime, IAssetFxModel> models = null)
{
var pfu = portfolio.UnWrapWrappers();
var pf = pfu.UnStripStrips();
//if (pf.AssetIds().Length != 1 || pf.FxPairs(model).Length != 0)
// throw new Exception("Portfolio can only contain a single asset and no FX indices for approximate CVA");
if (!pf.Instruments.All(x => x is AsianSwap))
{
throw new Exception("Approximate CVA only works for Asian Swap instruments");
}
if (pf.Instruments
.Select(x => Sign((x as AsianSwap).Notional))
.Distinct()
.Count() != 1)
{
throw new Exception("All swaps must be in same direction");
}
var cp = (pf.Instruments
.Select(x => Sign((x as AsianSwap).Notional))
.Distinct().First() == 1.0) ? OptionType.C : OptionType.P;
var replicatingPF = new Portfolio
{
Instruments = pf.Instruments
.Select(s => s as AsianSwap)
.Select(s =>
new AsianOption
{
AssetId = s.AssetId,
AssetFixingId = s.AssetFixingId,
AverageStartDate = s.AverageStartDate,
AverageEndDate = s.AverageEndDate,
CallPut = cp,
Strike = s.Strike,
Counterparty = s.Counterparty,
DiscountCurve = s.DiscountCurve,
FixingCalendar = s.FixingCalendar,
FixingDates = s.FixingDates,
HedgingSet = s.HedgingSet,
Notional = Abs(s.Notional),
PaymentCalendar = s.PaymentCalendar,
PaymentCurrency = s.PaymentCurrency,
PaymentDate = s.PaymentDate,
PaymentLag = s.PaymentLag,
PaymentLagRollType = s.PaymentLagRollType,
SpotLag = s.SpotLag,
SpotLagRollType = s.SpotLagRollType,
PortfolioName = s.PortfolioName,
TradeId = s.TradeId ?? Guid.NewGuid().ToString(),
FxConversionType = s.FxConversionType,
FxFixingDates = s.FxFixingDates,
FxFixingId = s.FxFixingId
} as IInstrument).ToList()
};
var exposures = new double[exposureDates.Length];
var m = model.Clone();
for (var i = 0; i < exposures.Length; i++)
{
if (models != null)
{
m = models[exposureDates[i]];
}
else
{
m = m.RollModel(exposureDates[i], currencyProvider);
}
var pvCube = replicatingPF.PV(m, reportingCurrency);
foreach (var row in pvCube.GetAllRows())
{
var tradeId = (string)row.MetaData[0];
var ins = replicatingPF.Instruments.Single(x => x.TradeId == tradeId) as AsianOption;
var df = m.FundingModel.GetCurve(ins.DiscountCurve).GetDf(m.BuildDate, ins.PaymentDate);
exposures[i] += row.Value / df;
}
exposures[i] = Max(0, exposures[i]);
}
return(exposures);
}
public void Process(IPathBlock block)
{
for (var path = 0; path < block.NumberOfPaths; path += Vector <double> .Count)
{
var stepsByFactor = new Dictionary <int, Vector <double>[]>();
foreach (var ix in _assetIndices)
{
stepsByFactor.Add(ix, block.GetStepsForFactor(path, ix).ToArray());
}
var indexCounter = 0;
var nextIndex = _calculationDateIndices[indexCounter];
var steps = stepsByFactor.First().Value;
var fixingDictionaries = _assetFxModel.FixingDictionaryNames.ToDictionary(x => x, x => (IFixingDictionary) new FixingDictionary(_assetFxModel.GetFixingDictionary(x)));
for (var i = 0; i < steps.Length; i++)
{
var d = _timeFeature.Dates[i];
for (var j = 0; j < Vector <double> .Count; j++)
{
for (var a = 0; a < _assetIndices.Length; a++)
{
if (!fixingDictionaries.TryGetValue(_assetIds[a], out var fd))
{
throw new Exception($"Fixing dictionary not found for asset {_assetIds[a]} ");
}
fd[d] = stepsByFactor[a][i][j];
}
}
if (i == nextIndex)
{
var currentDate = _calculationDates[indexCounter];
var newModel = _assetFxModel.Clone();
newModel.OverrideBuildDate(currentDate);
newModel.AddFixingDictionaries(fixingDictionaries);
var spotsByAsset = stepsByFactor.ToDictionary(x => x.Key, x => x.Value[i]);
for (var j = 0; j < Vector <double> .Count; j++)
{
//build on-path price curves in model
foreach (var spot in spotsByAsset)
{
var assetId = _assetIds[spot.Key];
var baseCurve = _assetFxModel.GetPriceCurve(assetId);
var spotOnCurve = baseCurve.GetPriceForFixingDate(currentDate);
var ratio = spot.Value[j] / spotOnCurve;
var newCurve = new FactorPriceCurve(baseCurve, ratio);
newModel.AddPriceCurve(assetId, newCurve);
}
var ead = _portfolio.SaCcrEAD(newModel, _reportingCurrency, _assetIdToGroupMap);
var capital = _counterpartyRiskWeight * ead;
if (!_expectedCapital.ContainsKey(currentDate))
{
lock (_threadLock)
{
if (!_expectedCapital.ContainsKey(currentDate))
{
_expectedCapital.Add(currentDate, 0.0);
}
}
}
if (double.IsNaN(capital) || double.IsInfinity(capital))
{
throw new Exception("Invalid capital generated");
}
_expectedCapital[currentDate] += capital;
}
indexCounter++;
nextIndex = indexCounter < _calculationDateIndices.Length
? _calculationDateIndices[indexCounter] : int.MaxValue;
}
}
}
}
