Gunel Jahangirova created MATH-1256:
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             Summary: Interval class upper and lower check
                 Key: MATH-1256
                 URL: https://issues.apache.org/jira/browse/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:

 @Test
  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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