public Fdm1DimSolver(FdmSolverDesc solverDesc,
FdmSchemeDesc schemeDesc,
FdmLinearOpComposite op)
{
solverDesc_ = solverDesc;
schemeDesc_ = schemeDesc;
op_ = op;
thetaCondition_ = new FdmSnapshotCondition(
0.99 * Math.Min(1.0 / 365.0,
solverDesc.condition.stoppingTimes().empty()
? solverDesc.maturity
: solverDesc.condition.stoppingTimes().First()));
conditions_ = FdmStepConditionComposite.joinConditions(thetaCondition_,
solverDesc.condition);
x_ = new InitializedList <double>(solverDesc.mesher.layout().size());
initialValues_ = new InitializedList <double>(solverDesc.mesher.layout().size());
resultValues_ = new Vector(solverDesc.mesher.layout().size());
FdmMesher mesher = solverDesc.mesher;
FdmLinearOpLayout layout = mesher.layout();
FdmLinearOpIterator endIter = layout.end();
for (FdmLinearOpIterator iter = layout.begin(); iter != endIter;
++iter)
{
initialValues_[iter.index()]
= solverDesc_.calculator.avgInnerValue(iter,
solverDesc.maturity);
x_[iter.index()] = mesher.location(iter, 0);
}
}
public FdmHullWhiteSolver(
Handle <HullWhite> model,
FdmSolverDesc solverDesc,
FdmSchemeDesc schemeDesc = null)
{
solverDesc_ = solverDesc;
schemeDesc_ = schemeDesc ?? new FdmSchemeDesc().Hundsdorfer();
model_ = model;
model_.registerWith(update);
}
public FdmBackwardSolver(FdmLinearOpComposite map,
FdmBoundaryConditionSet bcSet,
FdmStepConditionComposite condition,
FdmSchemeDesc schemeDesc)
{
map_ = map;
bcSet_ = bcSet;
condition_ = condition;
schemeDesc_ = schemeDesc;
}
public MakeFdBlackScholesVanillaEngine(GeneralizedBlackScholesProcess process)
{
process_ = process;
tGrid_ = 100;
xGrid_ = 100;
dampingSteps_ = 0;
schemeDesc_ = new FdmSchemeDesc().Douglas();
localVol_ = false;
illegalLocalVolOverwrite_ = null;
quantoHelper_ = null;
cashDividendModel_ = FdBlackScholesVanillaEngine.CashDividendModel.Spot;
}
public FdHullWhiteSwaptionEngine(
HullWhite model,
int tGrid = 100, int xGrid = 100,
int dampingSteps = 0, double invEps = 1e-5,
FdmSchemeDesc schemeDesc = null)
: base(model)
{
tGrid_ = tGrid;
xGrid_ = xGrid;
dampingSteps_ = dampingSteps;
schemeDesc_ = schemeDesc == null ? new FdmSchemeDesc().Douglas() : schemeDesc;
invEps_ = invEps;
}
public FdmBlackScholesSolver(
Handle <GeneralizedBlackScholesProcess> process,
double strike,
FdmSolverDesc solverDesc,
FdmSchemeDesc schemeDesc = null,
bool localVol = false,
double?illegalLocalVolOverwrite = null)
{
process_ = process;
strike_ = strike;
solverDesc_ = solverDesc;
schemeDesc_ = schemeDesc ?? new FdmSchemeDesc().Douglas();
localVol_ = localVol;
illegalLocalVolOverwrite_ = illegalLocalVolOverwrite;
}
// Constructor
public FdBlackScholesRebateEngine(
GeneralizedBlackScholesProcess process,
int tGrid = 100, int xGrid = 100, int dampingSteps = 0,
FdmSchemeDesc schemeDesc = null,
bool localVol = false,
double?illegalLocalVolOverwrite = null)
{
process_ = process;
tGrid_ = tGrid;
xGrid_ = xGrid;
dampingSteps_ = dampingSteps;
schemeDesc_ = schemeDesc == null ? new FdmSchemeDesc().Douglas() : schemeDesc;
localVol_ = localVol;
illegalLocalVolOverwrite_ = illegalLocalVolOverwrite;
process_.registerWith(update);
}
public FdBlackScholesVanillaEngine(
GeneralizedBlackScholesProcess process,
FdmQuantoHelper quantoHelper = null,
int tGrid = 100, int xGrid = 100, int dampingSteps = 0,
FdmSchemeDesc schemeDesc = null,
bool localVol = false,
double?illegalLocalVolOverwrite = null,
CashDividendModel cashDividendModel = CashDividendModel.Spot)
{
process_ = process;
tGrid_ = tGrid;
xGrid_ = xGrid;
dampingSteps_ = dampingSteps;
schemeDesc_ = schemeDesc == null ? new FdmSchemeDesc().Douglas() : schemeDesc;
localVol_ = localVol;
illegalLocalVolOverwrite_ = illegalLocalVolOverwrite;
quantoHelper_ = quantoHelper;
process_.registerWith(update);
}
public FdmBlackScholesSolver(
Handle <GeneralizedBlackScholesProcess> process,
double strike,
FdmSolverDesc solverDesc,
FdmSchemeDesc schemeDesc = null,
bool localVol = false,
double?illegalLocalVolOverwrite = null,
Handle <FdmQuantoHelper> quantoHelper = null)
{
process_ = process;
strike_ = strike;
solverDesc_ = solverDesc;
schemeDesc_ = schemeDesc ?? new FdmSchemeDesc().Douglas();
localVol_ = localVol;
illegalLocalVolOverwrite_ = illegalLocalVolOverwrite;
quantoHelper_ = quantoHelper;
quantoHelper_ = quantoHelper ?? new Handle <FdmQuantoHelper>();
process_.registerWith(update);
quantoHelper_.registerWith(update);
}
public void rollback(ref object a,
double from, double to,
int steps, int dampingSteps)
{
double deltaT = from - to;
int allSteps = steps + dampingSteps;
double dampingTo = from - (deltaT * dampingSteps) / allSteps;
if (dampingSteps > 0 &&
schemeDesc_.type != FdmSchemeDesc.FdmSchemeType.ImplicitEulerType)
{
ImplicitEulerScheme implicitEvolver = new ImplicitEulerScheme(map_, bcSet_);
FiniteDifferenceModel <ImplicitEulerScheme> dampingModel
= new FiniteDifferenceModel <ImplicitEulerScheme>(implicitEvolver, condition_.stoppingTimes());
dampingModel.rollback(ref a, from, dampingTo,
dampingSteps, condition_);
}
switch (schemeDesc_.type)
{
case FdmSchemeDesc.FdmSchemeType.HundsdorferType:
{
HundsdorferScheme hsEvolver = new HundsdorferScheme(schemeDesc_.theta, schemeDesc_.mu,
map_, bcSet_);
FiniteDifferenceModel <HundsdorferScheme>
hsModel = new FiniteDifferenceModel <HundsdorferScheme>(hsEvolver, condition_.stoppingTimes());
hsModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.DouglasType:
{
DouglasScheme dsEvolver = new DouglasScheme(schemeDesc_.theta, map_, bcSet_);
FiniteDifferenceModel <DouglasScheme>
dsModel = new FiniteDifferenceModel <DouglasScheme>(dsEvolver, condition_.stoppingTimes());
dsModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.CrankNicolsonType:
{
CrankNicolsonScheme cnEvolver = new CrankNicolsonScheme(schemeDesc_.theta, map_, bcSet_);
FiniteDifferenceModel <CrankNicolsonScheme>
cnModel = new FiniteDifferenceModel <CrankNicolsonScheme>(cnEvolver, condition_.stoppingTimes());
cnModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.CraigSneydType:
{
CraigSneydScheme csEvolver = new CraigSneydScheme(schemeDesc_.theta, schemeDesc_.mu,
map_, bcSet_);
FiniteDifferenceModel <CraigSneydScheme>
csModel = new FiniteDifferenceModel <CraigSneydScheme>(csEvolver, condition_.stoppingTimes());
csModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.ModifiedCraigSneydType:
{
ModifiedCraigSneydScheme csEvolver = new ModifiedCraigSneydScheme(schemeDesc_.theta,
schemeDesc_.mu,
map_, bcSet_);
FiniteDifferenceModel <ModifiedCraigSneydScheme>
mcsModel = new FiniteDifferenceModel <ModifiedCraigSneydScheme>(csEvolver, condition_.stoppingTimes());
mcsModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.ImplicitEulerType:
{
ImplicitEulerScheme implicitEvolver = new ImplicitEulerScheme(map_, bcSet_);
FiniteDifferenceModel <ImplicitEulerScheme>
implicitModel = new FiniteDifferenceModel <ImplicitEulerScheme>(implicitEvolver, condition_.stoppingTimes());
implicitModel.rollback(ref a, from, to, allSteps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.ExplicitEulerType:
{
ExplicitEulerScheme explicitEvolver = new ExplicitEulerScheme(map_, bcSet_);
FiniteDifferenceModel <ExplicitEulerScheme>
explicitModel = new FiniteDifferenceModel <ExplicitEulerScheme>(explicitEvolver, condition_.stoppingTimes());
explicitModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.MethodOfLinesType:
{
MethodOfLinesScheme methodOfLines = new MethodOfLinesScheme(schemeDesc_.theta, schemeDesc_.mu, map_, bcSet_);
FiniteDifferenceModel <MethodOfLinesScheme>
molModel = new FiniteDifferenceModel <MethodOfLinesScheme>(methodOfLines, condition_.stoppingTimes());
molModel.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
case FdmSchemeDesc.FdmSchemeType.TrBDF2Type:
{
FdmSchemeDesc trDesc = new FdmSchemeDesc().CraigSneyd();
CraigSneydScheme hsEvolver = new CraigSneydScheme(trDesc.theta, trDesc.mu, map_, bcSet_);
TrBDF2Scheme <CraigSneydScheme> trBDF2 = new TrBDF2Scheme <CraigSneydScheme>(
schemeDesc_.theta, map_, hsEvolver, bcSet_, schemeDesc_.mu);
FiniteDifferenceModel <TrBDF2Scheme <CraigSneydScheme> >
trBDF2Model = new FiniteDifferenceModel <TrBDF2Scheme <CraigSneydScheme> >(trBDF2, condition_.stoppingTimes());
trBDF2Model.rollback(ref a, dampingTo, to, steps, condition_);
}
break;
default:
Utils.QL_FAIL("Unknown scheme type");
break;
}
}
public MakeFdBlackScholesVanillaEngine withFdmSchemeDesc(FdmSchemeDesc schemeDesc)
{
schemeDesc_ = schemeDesc;
return(this);
}