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https://issues.apache.org/jira/browse/MATH-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350188#comment-14350188
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ntysdd edited comment on MATH-1196 at 3/6/15 10:32 AM:
-------------------------------------------------------
Not so easy.
Still wrong.
{code:xml}
public void test() {
final double x = 4503599627370497.0; // x = Math.pow(2, 52) + 1;
Assert.assertTrue(x == Math.rint(x));
Assert.assertTrue(x == FastMath.round(x));
}
{code}
was (Author: ntysdd):
Not so easy.
Still wrong.
public void test() {
final double x = 4503599627370497.0; // x = Math.pow(2, 52) + 1;
Assert.assertTrue(x == Math.rint(x));
Assert.assertTrue(x == FastMath.round(x));
}
> 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
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