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Posted to issues@commons.apache.org by "Xi Chen (Jira)" <ji...@apache.org> on 2019/09/02 10:00:14 UTC
[jira] [Created] (MATH-1496) An error in Gamma.java
Xi Chen created MATH-1496:
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Summary: An error in Gamma.java
Key: MATH-1496
URL: https://issues.apache.org/jira/browse/MATH-1496
Project: Commons Math
Issue Type: Bug
Affects Versions: 3.6.1
Reporter: Xi Chen
457 if (x >= C_LIMIT) {
458 // use method 4 (accurate to O(1/x^8)
459 double inv = 1 / (x * x);
460 // 1 1 1 1
461 // log(x) - ----- - ---------- + ------------ - ------------
462 // 2 x 12 x^2 120 x^4 252 x^6
463 return FastMath.log(x) - 0.5 / x - inv * ((1.0 / 12) + inv * (1.0 / 120 - inv / 252));
464 }
Line 463:
return FastMath.log(x) - 0.5 / x - inv * ((1.0 / 12) + inv * (1.0 / 120 - inv / 252));
Is it should be:
return FastMath.log(x) - 0.5 / x - inv * ((1.0 / 12) - inv * (1.0 / 120 - inv / 252));
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