org.apache.commons.math3.analysis.integration.gauss

## Class LegendreHighPrecisionRuleFactory

- java.lang.Object
- - org.apache.commons.math3.analysis.integration.gauss.BaseRuleFactory<BigDecimal>
  - - org.apache.commons.math3.analysis.integration.gauss.LegendreHighPrecisionRuleFactory

    public class LegendreHighPrecisionRuleFactory
    extends BaseRuleFactory<BigDecimal>

Factory that creates Gauss-type quadrature rule using Legendre polynomials. In this implementation, the lower and upper bounds of the natural interval of integration are -1 and 1, respectively. The Legendre polynomials are evaluated using the recurrence relation presented in .

Since:
  3.1
Version:
  $Id: LegendreHighPrecisionRuleFactory.java 1374187 2012-08-17 09:50:54Z erans $

### Field Summary

Fields
`private MathContext` `mContext` Settings for enhanced precision computations.
`private BigDecimal` `minusOne` The number `-1`.
`private BigDecimal` `oneHalf` The number `0.5`.
`private BigDecimal` `two` The number `2`.

### Constructor Summary

Constructors
Constructor and Description
`LegendreHighPrecisionRuleFactory()` Default precision is `DECIMAL128`.
`LegendreHighPrecisionRuleFactory(MathContext mContext)`

### Method Summary

Methods
`protected Pair<BigDecimal[],BigDecimal[]>` `computeRule(int numberOfPoints)` Computes the rule for the given order.

### Methods inherited from class org.apache.commons.math3.analysis.integration.gauss.BaseRuleFactory

`addRule, getRule, getRuleInternal`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Field Detail

#### mContext

    private final MathContext mContext

Settings for enhanced precision computations.

#### two

    private final BigDecimal two

The number `2`.

#### minusOne

    private final BigDecimal minusOne

The number `-1`.

#### oneHalf

    private final BigDecimal oneHalf

The number `0.5`.

### Constructor Detail

#### LegendreHighPrecisionRuleFactory

    public LegendreHighPrecisionRuleFactory()

Default precision is `DECIMAL128`.

#### LegendreHighPrecisionRuleFactory

    public LegendreHighPrecisionRuleFactory(MathContext mContext)

Parameters:
  `mContext` - Precision setting for computing the quadrature rules.

### Method Detail

#### computeRule

    protected Pair<BigDecimal[],BigDecimal[]> computeRule(int numberOfPoints)

Computes the rule for the given order.

Specified by:
  `computeRule` in class `BaseRuleFactory<BigDecimal>`
Parameters:
  `numberOfPoints` - Order of the rule to be computed.
Returns:
  the computed rule.
Throws:
  `NotStrictlyPositiveException` - if `numberOfPoints < 1`.