[NUMBERS-153] Gamma.digamma() and Gamma.trigamma() throw stack overflow exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Implemented
• Affects Version/s: 1.0-beta1
• Fix Version/s: 1.0
• Component/s: gamma
• External issue URL: https://issues.apache.org/jira/browse/MATH-1561
• Assignee: Unassigned
• Reporter: Dmitriy V. Golovashkin
• Created: 29/Oct/20 15:31
• Updated: 29/May/21 01:59
• Resolved: 29/Oct/20 23:07

Description

java.lang.StackOverflowError is thrown in

  double x = -10_000;
  double ans1 = Gamma.digamma(x);  // stack overflow
  double ans2 = Gamma.trigamma(x); // stack overflow

It would be nice if the methods returned NaN / Infinity, rather than abort calculations (due to recursion gone wild).

Please see the initial report in Commons Math3:

https://issues.apache.org/jira/browse/MATH-1561

Issue Links

• supercedes: MATH-1561 StackOverflowError is thrown in Gamma.digamma(x) and Gamma.trigamma(x)