You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@commons.apache.org by "Sebb (JIRA)" <ji...@apache.org> on 2011/01/24 20:16:46 UTC
[jira] Created: (MATH-502) FastMath scalb() does not handle large
magnitude exponents correctly
FastMath scalb() does not handle large magnitude exponents correctly
--------------------------------------------------------------------
Key: MATH-502
URL: https://issues.apache.org/jira/browse/MATH-502
Project: Commons Math
Issue Type: Bug
Affects Versions: 2.2, 3.0
Reporter: Sebb
Fix For: 2.2, 3.0
scalb does not handle MAX_VALUE exponents properly:
double scalb(-1.7976931348623157E308, 2147483647) expected -Infinity actual -8.988465674311579E307 entries [6, 5]
double scalb(1.7976931348623157E308, 2147483647) expected Infinity actual 8.988465674311579E307 entries [7, 5]
double scalb(-1.1102230246251565E-16, 2147483647) expected -Infinity actual -5.551115123125783E-17 entries [8, 5]
double scalb(1.1102230246251565E-16, 2147483647) expected Infinity actual 5.551115123125783E-17 entries [9, 5]
double scalb(-2.2250738585072014E-308, 2147483647) expected -Infinity actual -0.0 entries [10, 5]
double scalb(2.2250738585072014E-308, 2147483647) expected Infinity actual 0.0 entries [11, 5]
float scalb(3.4028235E38, 2147483647) expected Infinity actual 1.7014117E38 entries [7, 5]
float scalb(-3.4028235E38, 2147483647) expected -Infinity actual -1.7014117E38 entries [9, 5]
It looks as though the problem is with the calculation of the scaledExponent - for large values, this can wrap round, so some of the checks against its value may give misleading results.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] Resolved: (MATH-502) FastMath scalb() does not handle large
magnitude exponents correctly
Posted by "Luc Maisonobe (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe resolved MATH-502.
--------------------------------
Resolution: Fixed
fixed in subversion repository as of r1062928 for trunk and r1062929 for branch 2.X
> FastMath scalb() does not handle large magnitude exponents correctly
> --------------------------------------------------------------------
>
> Key: MATH-502
> URL: https://issues.apache.org/jira/browse/MATH-502
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.2, 3.0
> Reporter: Sebb
> Fix For: 2.2, 3.0
>
>
> scalb does not handle MAX_VALUE exponents properly:
> double scalb(-1.7976931348623157E308, 2147483647) expected -Infinity actual -8.988465674311579E307 entries [6, 5]
> double scalb(1.7976931348623157E308, 2147483647) expected Infinity actual 8.988465674311579E307 entries [7, 5]
> double scalb(-1.1102230246251565E-16, 2147483647) expected -Infinity actual -5.551115123125783E-17 entries [8, 5]
> double scalb(1.1102230246251565E-16, 2147483647) expected Infinity actual 5.551115123125783E-17 entries [9, 5]
> double scalb(-2.2250738585072014E-308, 2147483647) expected -Infinity actual -0.0 entries [10, 5]
> double scalb(2.2250738585072014E-308, 2147483647) expected Infinity actual 0.0 entries [11, 5]
> float scalb(3.4028235E38, 2147483647) expected Infinity actual 1.7014117E38 entries [7, 5]
> float scalb(-3.4028235E38, 2147483647) expected -Infinity actual -1.7014117E38 entries [9, 5]
> It looks as though the problem is with the calculation of the scaledExponent - for large values, this can wrap round, so some of the checks against its value may give misleading results.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] [Closed] (MATH-502) FastMath scalb() does not handle large
magnitude exponents correctly
Posted by "Luc Maisonobe (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe closed MATH-502.
------------------------------
Closing issue as it was included in version 2.2, which has been released
> FastMath scalb() does not handle large magnitude exponents correctly
> --------------------------------------------------------------------
>
> Key: MATH-502
> URL: https://issues.apache.org/jira/browse/MATH-502
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.2, 3.0
> Reporter: Sebb
> Fix For: 2.2, 3.0
>
>
> scalb does not handle MAX_VALUE exponents properly:
> double scalb(-1.7976931348623157E308, 2147483647) expected -Infinity actual -8.988465674311579E307 entries [6, 5]
> double scalb(1.7976931348623157E308, 2147483647) expected Infinity actual 8.988465674311579E307 entries [7, 5]
> double scalb(-1.1102230246251565E-16, 2147483647) expected -Infinity actual -5.551115123125783E-17 entries [8, 5]
> double scalb(1.1102230246251565E-16, 2147483647) expected Infinity actual 5.551115123125783E-17 entries [9, 5]
> double scalb(-2.2250738585072014E-308, 2147483647) expected -Infinity actual -0.0 entries [10, 5]
> double scalb(2.2250738585072014E-308, 2147483647) expected Infinity actual 0.0 entries [11, 5]
> float scalb(3.4028235E38, 2147483647) expected Infinity actual 1.7014117E38 entries [7, 5]
> float scalb(-3.4028235E38, 2147483647) expected -Infinity actual -1.7014117E38 entries [9, 5]
> It looks as though the problem is with the calculation of the scaledExponent - for large values, this can wrap round, so some of the checks against its value may give misleading results.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira