added compareTo method with epsilon
JIRA: MATH-247 git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@749139 13f79535-47bb-0310-9956-ffa450edef68
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@ -347,6 +347,25 @@ public final class MathUtils {
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return logSum;
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}
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/**
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* Compares two numbers given some amount of allowed error.
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*
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* @param x the first number
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* @param y the second number
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* @param eps the amount of error to allow when checking for equality
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* @return <ul><li>0 if {@link #equals(double, double, double) equals(x, y, eps)}</li>
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* <li>< 0 if !{@link #equals(double, double, double) equals(x, y, eps)} && x < y</li>
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* <li>> 0 if !{@link #equals(double, double, double) equals(x, y, eps)} && x > y</li></ul>
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*/
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public static int compareTo(double x, double y, double eps) {
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if (equals(x, y, eps)) {
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return 0;
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} else if (x < y) {
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return -1;
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}
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return 1;
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}
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/**
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* Returns the <a href="http://mathworld.wolfram.com/HyperbolicCosine.html">
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* hyperbolic cosine</a> of x.
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@ -305,6 +305,12 @@ public final class MathUtilsTest extends TestCase {
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.isInfinite(x));
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}
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public void testCompareTo() {
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assertEquals(0, MathUtils.compareTo(152.33, 152.32, .011));
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assertTrue(MathUtils.compareTo(152.308, 152.32, .011) < 0);
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assertTrue(MathUtils.compareTo(152.33, 152.318, .011) > 0);
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}
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public void testCosh() {
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double x = 3.0;
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double expected = 10.06766;
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