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From "Ralf Wiebicke (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-936) RandomDataGenerator#nextLong violates bounds
Date Mon, 18 Feb 2013 10:51:12 GMT
Ralf Wiebicke created MATH-936:
----------------------------------

             Summary: RandomDataGenerator#nextLong violates bounds
                 Key: MATH-936
                 URL: https://issues.apache.org/jira/browse/MATH-936
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.1
            Reporter: Ralf Wiebicke
         Attachments: RandomGeneratorLongTest.java

I attached a test.

If the underlying RandomGenerator returns 0.0, then nextLong returns Long.MIN_VALUE, although
the lower bound is Long.MIN_VALUE+1.

The javadoc of RandomGenerator#nextDouble does not clearly define, whether the result includes
the lower border of 0.0 or not.

In java.util.Random it clearly defined as included: "uniformly from the range 0.0d (inclusive)
to 1.0d (exclusive)". And the existence of JDKRandomGenerator suggests, that RandomGenerator
should have the same contract.

I tested with version 3.1.1 from mvnrepository



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