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  1. Commons Math
  2. MATH-1318

Implement reflection formula to digamma function to improve performance on negative values.

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.0
    • Labels:
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      Description

      The performance of the digamma( x ) function is in O(|x|) for negative values. Implementing the reflection formula (https://en.wikipedia.org/wiki/Digamma_function#Reflection_formula) can improve the performance in that case.

      new pull request: https://github.com/apache/commons-math/pull/32

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            • Assignee:
              Unassigned
              Reporter:
              eric.prescottgagnon@jda.com Eric Prescott-Gagnon
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