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From "David Tonhofer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-1022) Confused by the API docs for org.apache.commons.math3.analysis.function
Date Tue, 13 Aug 2013 09:58:47 GMT
David Tonhofer created MATH-1022:
------------------------------------

             Summary: Confused by the API docs for org.apache.commons.math3.analysis.function
                 Key: MATH-1022
                 URL: https://issues.apache.org/jira/browse/MATH-1022
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.3
            Reporter: David Tonhofer


Something is wrong or unclear...

We read:

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Logistic.Parametric.html

   "Parametric function where the input array contains the parameters
    of the logit function, ordered as follows: "

 --> But the "logit" function is not the "logistic" function.

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Sigmoid.Parametric.html

   "Parametric function where the input array contains the parameters of
   the logit function, ordered as follows: "

 --> But the "logit" function is not the "sigmoid" function, and what is
     the difference between the Logistic Function snd the Sigmoid function?

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Logit.Parametric.html

   "Parametric function where the input array contains the parameters of
    the logit function, ordered as follows: "

 --> That sounds correct.


References:

http://en.wikipedia.org/wiki/Logistic_function
http://en.wikipedia.org/wiki/Logit
http://en.wikipedia.org/wiki/Sigmoid_function



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