commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ntysdd (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1196) FastMath.round (like Math.round) returns surprising results for some arguments
Date Sat, 07 Mar 2015 07:37:38 GMT

    [ https://issues.apache.org/jira/browse/MATH-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351466#comment-14351466
] 

ntysdd commented on MATH-1196:
------------------------------

Both Java 6 and Java 7 fail this test.
Java 8 has a different implementation.

> FastMath.round (like Math.round) returns surprising results for some arguments
> ------------------------------------------------------------------------------
>
>                 Key: MATH-1196
>                 URL: https://issues.apache.org/jira/browse/MATH-1196
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.4.1
>            Reporter: Phil Steitz
>
> The first assertion in the test case below succeeds, but the second fails
> {code}
>  /*
>      * http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6430675
>      */
>     @Test
>     public void testRoundDown() {
>         final double x = 0x1.fffffffffffffp-2;
>         Assert.assertTrue(x < 0.5d);
>         Assert.assertEquals(0, FastMath.round(x));
>     }
> {code}
> This is being tracked as a JDK (actually spec) bug here:
> http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6430675



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message