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MATH-843 

Corrected documentation for "Precision.EPSILON".


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1370547 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2012-08-07 21:38:58 +00:00
parent 5add6876dc
commit 5827a6faad
2 changed files with 14 additions and 2 deletions
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4
src/main/java/org/apache/commons/math3/util/Precision.java
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@ -30,8 +30,8 @@ import org.apache.commons.math3.exception.util.LocalizedFormats;
*/ */
public class Precision { public class Precision {
/** /**
* Smallest positive number such that {@code 1 - EPSILON} is not * Largest double-precision floating-point number such that
* numerically equal to 1. * {@code 1 + EPSILON} is numerically equal to 1.
* <br/> * <br/>
* In IEEE 754 arithmetic, this is 2<sup>-53</sup>. * In IEEE 754 arithmetic, this is 2<sup>-53</sup>.
*/ */

12
src/test/java/org/apache/commons/math3/util/PrecisionTest.java
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@ -488,4 +488,16 @@ public class PrecisionTest {
Assert.assertTrue(nonRepresentableCount / (double) numTrials > 0.9); Assert.assertTrue(nonRepresentableCount / (double) numTrials > 0.9);
} }
@Test
public void testMath843() {
final double afterEpsilon = FastMath.nextAfter(Precision.EPSILON,
Double.POSITIVE_INFINITY);
// a) 1 + EPSILON is equal to 1.
Assert.assertTrue(1 + Precision.EPSILON == 1);
// b) 1 + "the number after EPSILON" is not equal to 1.
Assert.assertFalse(1 + afterEpsilon == 1);
}
} }