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From "Gilles Sadowski (Jira)" <j...@apache.org>
Subject [jira] [Created] (NUMBERS-136) "log10" inconsistent with "log"
Date Thu, 03 Oct 2019 14:50:01 GMT
Gilles Sadowski created NUMBERS-136:
---------------------------------------

             Summary: "log10" inconsistent with "log"
                 Key: NUMBERS-136
                 URL: https://issues.apache.org/jira/browse/NUMBERS-136
             Project: Commons Numbers
          Issue Type: Bug
          Components: complex
            Reporter: Gilles Sadowski
             Fix For: 1.0


For special cases (containing NaN or infinities), method {{log10}} does not return the same
values as {{log()}} (cf. case commented out  below).

{code}
    @Test
    public void testLog10Consistency() {
        // Infinities should map to the same values as computed with "log()".
        // Assertions.assertEquals(infInf.log(), infInf.log10());
        Assertions.assertEquals(infNegInf.log(), infNegInf.log10());
        Assertions.assertEquals(negInfInf.log(), negInfInf.log10());
        // Assertions.assertEquals(infNaN.log(), infNaN.log10());
        Assertions.assertEquals(negInfNaN.log(), negInfNaN.log10());
        // Assertions.assertEquals(nanInf.log(), nanInf.log10());
        Assertions.assertEquals(nanNegInf.log(), nanNegInf.log10());
    }
{code}

To avoid duplication, I suggest that {{log10}} calls {{log}} as part of its implementation.



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