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Posted to issues@commons.apache.org by "Gilles Sadowski (Jira)" <ji...@apache.org> on 2019/10/03 14:50:01 UTC
[jira] [Created] (NUMBERS-136) "log10" inconsistent with "log"
Gilles Sadowski created NUMBERS-136:
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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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