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Added a method to check points in the Interval class. 

JIRA: MATH-889

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1405706 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2012-11-05 08:00:19 +00:00
parent 387e7f9fa9
commit 2a41e40c15
3 changed files with 96 additions and 0 deletions
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3
src/changes/changes.xml
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@ -52,6 +52,9 @@ If the output is not quite correct, check for invisible trailing spaces!
<body>
<release version="3.1" date="TBD" description="
">
<action dev="luc" type="add" issue="MATH-889">
Added a method to check points in the Interval class, with a tolerance for boundary.
</action>
<action dev="psteitz" type="add" issue="MATH-878" due-to="Radoslav Tsvetkov">
Added G-test statistics.
</action>

19
src/main/java/org/apache/commons/math3/geometry/euclidean/oned/Interval.java
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@ -16,6 +16,8 @@
*/
package org.apache.commons.math3.geometry.euclidean.oned;
import org.apache.commons.math3.geometry.partitioning.Region.Location;
/** This class represents a 1D interval.
* @see IntervalsSet
@ -67,4 +69,21 @@ public class Interval {
return 0.5 * (lower + upper);
}
/** Check a point with respect to the interval.
* @param point point to check
* @param tolerance tolerance below which points are considered to
* belong to the boundary
* @return a code representing the point status: either {@link
* Location#INSIDE}, {@link Location#OUTSIDE} or {@link Location#BOUNDARY}
*/
public Location checkPoint(final double point, final double tolerance) {
if (point < lower - tolerance || point > upper + tolerance) {
return Location.OUTSIDE;
} else if (point > lower + tolerance && point < upper - tolerance) {
return Location.INSIDE;
} else {
return Location.BOUNDARY;
}
}
}

74
src/test/java/org/apache/commons/math3/geometry/euclidean/oned/IntervalTest.java Normal file
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@ -0,0 +1,74 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.math3.geometry.euclidean.oned;
import org.apache.commons.math3.geometry.partitioning.Region;
import org.apache.commons.math3.util.FastMath;
import org.apache.commons.math3.util.Precision;
import org.junit.Assert;
import org.junit.Test;
public class IntervalTest {
@Test
public void testInterval() {
Interval interval = new Interval(2.3, 5.7);
Assert.assertEquals(3.4, interval.getLength(), 1.0e-10);
Assert.assertEquals(4.0, interval.getMidPoint(), 1.0e-10);
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(2.3, 1.0e-10));
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(5.7, 1.0e-10));
Assert.assertEquals(Region.Location.OUTSIDE, interval.checkPoint(1.2, 1.0e-10));
Assert.assertEquals(Region.Location.OUTSIDE, interval.checkPoint(8.7, 1.0e-10));
Assert.assertEquals(Region.Location.INSIDE, interval.checkPoint(3.0, 1.0e-10));
Assert.assertEquals(2.3, interval.getLower(), 1.0e-10);
Assert.assertEquals(5.7, interval.getUpper(), 1.0e-10);
}
@Test
public void testTolerance() {
Interval interval = new Interval(2.3, 5.7);
Assert.assertEquals(Region.Location.OUTSIDE, interval.checkPoint(1.2, 1.0));
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(1.2, 1.2));
Assert.assertEquals(Region.Location.OUTSIDE, interval.checkPoint(8.7, 2.9));
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(8.7, 3.1));
Assert.assertEquals(Region.Location.INSIDE, interval.checkPoint(3.0, 0.6));
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(3.0, 0.8));
}
@Test
public void testInfinite() {
Interval interval = new Interval(9.0, Double.POSITIVE_INFINITY);
Assert.assertEquals(Region.Location.BOUNDARY, interval.checkPoint(9.0, 1.0e-10));
Assert.assertEquals(Region.Location.OUTSIDE, interval.checkPoint(8.4, 1.0e-10));
for (double e = 1.0; e <= 6.0; e += 1.0) {
Assert.assertEquals(Region.Location.INSIDE,
interval.checkPoint(FastMath.pow(10.0, e), 1.0e-10));
}
Assert.assertTrue(Double.isInfinite(interval.getLength()));
Assert.assertEquals(9.0, interval.getLower(), 1.0e-10);
Assert.assertTrue(Double.isInfinite(interval.getUpper()));
}
@Test
public void testSinglePoint() {
Interval interval = new Interval(1.0, 1.0);
Assert.assertEquals(0.0, interval.getLength(), Precision.SAFE_MIN);
Assert.assertEquals(1.0, interval.getMidPoint(), Precision.EPSILON);
}
}