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From "Gunel Jahangirova (JIRA)" <>
Subject [jira] [Created] (MATH-1256) Interval class upper and lower check
Date Mon, 17 Aug 2015 09:25:47 GMT
Gunel Jahangirova created MATH-1256:

             Summary: Interval class upper and lower check
                 Key: MATH-1256
             Project: Commons Math
          Issue Type: Bug
            Reporter: Gunel Jahangirova
            Priority: Minor

In class Interval, which is in the package org.apache.commons.math4.geometry.euclidean.oned
it is possible to pass the value for variable upper  less than the value of variable lower,
which is logically incorrect and  also causes the method getSize() to return negative value.

For example:

  public void test1()  throws Throwable  {
      Interval interval0 = new Interval(0.0, (-1.0));
      double double0 = interval0.getSize();
      assertEquals((-1.0), double0, 0.01D);

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