| /* |
| * 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.numbers.gamma; |
| |
| import org.junit.jupiter.api.Assertions; |
| import org.junit.jupiter.api.Test; |
| |
| /** |
| * Tests for {@link ErfDifference}. |
| */ |
| public class ErfDifferenceTest { |
| /** |
| * Test the implementation of ErfDifference.value(double, double) for consistency |
| * with results obtained from Erf.value(double) and Erfc.value(double). |
| */ |
| @Test |
| public void testTwoArgumentErf() { |
| final double[] xi = new double[] { -2, -1, -0.9, -0.1, 0, 0.1, 0.9, 1, 2 }; |
| for(double x1 : xi) { |
| for(double x2 : xi) { |
| double a = ErfDifference.value(x1, x2); |
| double b = Erf.value(x2) - Erf.value(x1); |
| double c = Erfc.value(x1) - Erfc.value(x2); |
| Assertions.assertEquals(a, b, 1e-15); |
| Assertions.assertEquals(a, c, 1e-15); |
| } |
| } |
| } |
| } |