| /* |
| * 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; |
| |
| /** |
| * Inverse of the <a href="http://mathworld.wolfram.com/Erfc.html">complementary error function</a>. |
| * <p> |
| * This implementation is described in the paper: |
| * <a href="http://people.maths.ox.ac.uk/gilesm/files/gems_erfinv.pdf">Approximating |
| * the erfinv function</a> by Mike Giles, Oxford-Man Institute of Quantitative Finance, |
| * which was published in GPU Computing Gems, volume 2, 2010. |
| * The source code is available <a href="http://gpucomputing.net/?q=node/1828">here</a>. |
| * </p> |
| */ |
| public final class InverseErfc { |
| /** Private constructor. */ |
| private InverseErfc() { |
| // intentional empty. |
| } |
| |
| /** |
| * Returns the inverse complementary error function. |
| * |
| * @param x Value. |
| * @return t such that {@code x =} {@link Erfc#value(double) Erfc.value(t)}. |
| */ |
| public static double value(double x) { |
| return InverseErf.value(1 - x); |
| } |
| } |