SegmentIntegral Class Reference

Integral of a one-dimensional function. More...

#include <ql/math/integrals/segmentintegral.hpp>

Inherits Integrator.

Public Member Functions
	SegmentIntegral (Size intervals)

Protected Member Functions
virtual Real	integrate (const ext::function< Real(Real)> &f, Real a, Real b) const

Detailed Description

Integral of a one-dimensional function.

Given a number \( N \) of intervals, the integral of a function \( f \) between \( a \) and \( b \) is calculated by means of the trapezoid formula

\[ \int_{a}^{b} f \mathrm{d}x = \frac{1}{2} f(x_{0}) + f(x_{1}) + f(x_{2}) + \dots + f(x_{N-1}) + \frac{1}{2} f(x_{N}) \]

where \( x_0 = a \), \( x_N = b \), and \( x_i = a+i \Delta x \) with \( \Delta x = (b-a)/N \).

Tests:

the correctness of the result is tested by checking it against known good values.