# QuantLib_LocalVolCurve man page

LocalVolCurve — Local volatility curve derived from a Black curve.

## Synopsis

`#include <ql/termstructures/volatility/equityfx/localvolcurve.hpp>`

Inherits **LocalVolTermStructure**.

### Public Member Functions

**LocalVolCurve** (const **Handle**< **BlackVarianceCurve** > &curve)

**TermStructure interface**

const **Date** & **referenceDate** () const

the date at which discount = 1.0 and/or variance = 0.0 **Calendar calendar** () const

the calendar used for reference and/or option date calculation **DayCounter dayCounter** () const

the day counter used for date/time conversion **Date maxDate** () const

the latest date for which the curve can return values

**VolatilityTermStructure interface**

**Real minStrike** () const

the minimum strike for which the term structure can return vols **Real maxStrike** () const

the maximum strike for which the term structure can return vols

**Visitability**

virtual void **accept** (**AcyclicVisitor** &)

### Protected Member Functions

**Volatility localVolImpl** (**Time**, **Real**) const

### Additional Inherited Members

## Detailed Description

Local volatility curve derived from a Black curve.

## Member Function Documentation

### Volatility localVolImpl (Time t, Real dummy) const [protected], [virtual]

The relation [ int_0^T sigma_L^2(t)dt = sigma_B^2 T ] holds, where $ sigma_L(t) $ is the local volatility at time $ t $ and $ sigma_B(T) $ is the Black volatility for maturity $ T $. From the above, the formula [ sigma_L(t) = sqrt{ac{mathrm{d}}{mathrm{d}t}sigma_B^2(t)t} ] can be deduced which is here implemented.

Implements **LocalVolTermStructure**.

## Author

Generated automatically by Doxygen for QuantLib from the source code.

## Referenced By

LocalVolCurve(3) and localVolImpl(3) are aliases of QuantLib_LocalVolCurve(3).