Package org.apache.commons.numbers.gamma
Class ErfDifference
- java.lang.Object
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- org.apache.commons.numbers.gamma.ErfDifference
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public final class ErfDifference extends java.lang.Object
Computes the difference betweenerror function values
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Field Summary
Fields Modifier and Type Field Description private static double
X_CRIT
This number solveserf(x) = 0.5
within 1 ulp.
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Constructor Summary
Constructors Modifier Constructor Description private
ErfDifference()
Private constructor.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static double
value(double x1, double x2)
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Field Detail
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X_CRIT
private static final double X_CRIT
This number solveserf(x) = 0.5
within 1 ulp. More precisely, the current implementations ofErf.value(double)
andErfc.value(double)
satisfy:Erf.value(X_CRIT) == 0.5
,Erf.value(Math.nextUp(X_CRIT)) > 0.5
,Erfc.value(X_CRIT) == 0.5
, andErfc.value(Math.nextUp(X_CRIT)) < 0.5
- See Also:
- Constant Field Values
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Method Detail
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value
public static double value(double x1, double x2)
- Parameters:
x1
- First value.x2
- Second value.- Returns:
Erf.value(x2) - Erf.value(x1)
.- Throws:
java.lang.ArithmeticException
- if the algorithm fails to converge.
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