ExtendedTrapezoidIntegrator1D (OpenGamma Strata)

java.lang.Object
- com.opengamma.strata.math.impl.integration.Integrator1D<Double,Double>
- - com.opengamma.strata.math.impl.integration.ExtendedTrapezoidIntegrator1D

All Implemented Interfaces:

Integrator<Double,Double,Function<Double,Double>>
```
public class ExtendedTrapezoidIntegrator1D
extends Integrator1D<Double,Double>
```
The trapezoid integration rule is a two-point Newton-Cotes formula that approximates the area under the curve as a trapezoid. For a function $f(x)$, $$ \begin{align*} \int^{x_2} _{x_1} f(x)dx \approx \frac{1}{2}(x_2 - x_1)(f(x_1) + f(x_2)) \end{align*} $$
This class is a wrapper for the Commons Math library implementation of trapezoidal integration.

Constructor Summary

Constructors
Constructor Description

ExtendedTrapezoidIntegrator1D()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Double`	`integrate(Function<Double,Double> f, Double lower, Double upper)`	Trapezoid integration method.

Methods inherited from class com.opengamma.strata.math.impl.integration.Integrator1D
integrate

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ExtendedTrapezoidIntegrator1D
```
public ExtendedTrapezoidIntegrator1D()
```
- Method Detail
  - integrate
```
public Double integrate(Function<Double,Double> f,
                        Double lower,
                        Double upper)
```
    Trapezoid integration method. Note that the Commons implementation fails if the lower bound is larger than the upper - in this case, the bounds are reversed and the result negated. 1-D integration method.
    
    Specified by:
    
    integrate in class Integrator1D<Double,Double>
    
    Parameters:
    
    f - The function to integrate, not null
    
    lower - The lower bound, not null
    
    upper - The upper bound, not null
    
    Returns:
    
    The result of the integration