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commit 616cfaebdd8902cb5aa963866d8e4f97a129356c Author: Alex Herbert <[email protected]> AuthorDate: Tue Apr 14 16:15:25 2026 +0100 Comment partial implementation --- .../commons/rng/sampling/distribution/InternalGamma.java | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/InternalGamma.java b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/InternalGamma.java index 732a06f6..409cd725 100644 --- a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/InternalGamma.java +++ b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/InternalGamma.java @@ -61,13 +61,9 @@ final class InternalGamma { // Class is package-private on purpose; do not make private InternalGamma() {} /** - * Computes the function \( \ln \Gamma(x) \) for \( x \gt 0 \). + * Computes the function \( \ln \Gamma(x) \) for \( x \geq 8 \). * - * <p> - * For \( x \leq 8 \), the implementation is based on the double precision - * implementation in the <em>NSWC Library of Mathematics Subroutines</em>, - * {@code DGAMLN}. For \( x \geq 8 \), the implementation is based on - * </p> + * <p>The implementation is based on</p> * * <ul> * <li><a href="https://mathworld.wolfram.com/GammaFunction.html";>Gamma @@ -79,8 +75,10 @@ final class InternalGamma { // Class is package-private on purpose; do not make * approximation</a></li> * </ul> * - * @param x Argument. - * @return \( \ln \Gamma(x) \), or {@code NaN} if {@code x <= 0}. + * <p>Warning: This method is not accurate when x is less than 8. + * + * @param x Argument (must be above 8). + * @return \( \ln \Gamma(x) \) */ static double logGamma(double x) { // Stripped-down version of the same method defined in "Commons Math":
