Package org.apache.commons.numbers.gamma
Class Erfcx
java.lang.Object
org.apache.commons.numbers.gamma.Erfcx
Scaled complementary error function.
\[ \operatorname{erfcx}(z) = \operatorname{erfc}(z)\ e^{z^2} \]
For large z the value is approximately:
\[ \operatorname{erfcx}(z) = \frac{1}{z \sqrt{\pi}} \]
- Since:
- 1.1
- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic double
value
(double x) Returns the scaled complementary error function.
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Constructor Details
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Erfcx
private Erfcx()Private constructor.
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Method Details
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value
public static double value(double x) Returns the scaled complementary error function.Special cases:
- If the argument is 0, then the result is 1.
- If the argument is +infinity, then the result is 0.
- If the argument is negative and
exp(x*x)
is infinite, then the result is +infinity. - If the argument is nan, then the result is nan.
- Parameters:
x
- Value.- Returns:
- the scaled complementary error function.
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