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Posted to issues@commons.apache.org by "Aleksei Dievskii (JIRA)" <ji...@apache.org> on 2013/09/27 17:32:04 UTC
[jira] [Created] (MATH-1039) Logarithmic probability and density
calculations for the distributions
Aleksei Dievskii created MATH-1039:
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Summary: Logarithmic probability and density calculations for the distributions
Key: MATH-1039
URL: https://issues.apache.org/jira/browse/MATH-1039
Project: Commons Math
Issue Type: New Feature
Reporter: Aleksei Dievskii
Priority: Minor
A person working with fairly small probabilities and densities often employs their logarithms to increase precision and decrease the chance of an underflow. However, just taking a log of the probability() or density() return value doesn't necessary solve the problem, as these methods themselves could have lost precision or underflowed. This patch introduces new logProbability() and logDensity() methods overriden for many relevant distribution. The patch also introduces tests of these new methods.
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