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Commons Math example source code file (ErfTest.java)
The Commons Math ErfTest.java source code/* * 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.math.special; import org.apache.commons.math.MathException; import junit.framework.TestCase; /** * @version $Revision: 924345 $ $Date: 2010-03-17 12:03:56 -0400 (Wed, 17 Mar 2010) $ */ public class ErfTest extends TestCase { public void testErf0() throws MathException { double actual = Erf.erf(0.0); double expected = 0.0; assertEquals(expected, actual, 1.0e-5); } public void testErf1960() throws MathException { double x = 1.960 / Math.sqrt(2.0); double actual = Erf.erf(x); double expected = 0.95; assertEquals(expected, actual, 1.0e-5); actual = Erf.erf(-x); expected = -expected; assertEquals(expected, actual, 1.0e-5); } public void testErf2576() throws MathException { double x = 2.576 / Math.sqrt(2.0); double actual = Erf.erf(x); double expected = 0.99; assertEquals(expected, actual, 1.0e-5); actual = Erf.erf(-x); expected = -expected; assertEquals(expected, actual, 1.0e-5); } public void testErf2807() throws MathException { double x = 2.807 / Math.sqrt(2.0); double actual = Erf.erf(x); double expected = 0.995; assertEquals(expected, actual, 1.0e-5); actual = Erf.erf(-x); expected = -expected; assertEquals(expected, actual, 1.0e-5); } public void testErf3291() throws MathException { double x = 3.291 / Math.sqrt(2.0); double actual = Erf.erf(x); double expected = 0.999; assertEquals(expected, actual, 1.0e-5); actual = Erf.erf(-x); expected = -expected; assertEquals(expected, actual, 1.0e-5); } /** * MATH-301 */ public void testLargeValues() throws Exception { for (int i = 1; i < 200; i++) { double result = Erf.erf(i); assertFalse(Double.isNaN(result)); assertTrue(result > 0 && result <= 1); } } } Other Commons Math examples (source code examples)Here is a short list of links related to this Commons Math ErfTest.java source code file: |
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