| /* |
| * 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.distribution; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.math.MathException; |
| import org.apache.commons.math.MathRuntimeException; |
| import org.apache.commons.math.exception.util.LocalizedFormats; |
| |
| /** |
| * Base class for probability distributions. |
| * |
| * @version $Revision: 1054524 $ $Date: 2011-01-03 05:59:18 +0100 (lun. 03 janv. 2011) $ |
| */ |
| public abstract class AbstractDistribution |
| implements Distribution, Serializable { |
| |
| /** Serializable version identifier */ |
| private static final long serialVersionUID = -38038050983108802L; |
| |
| /** |
| * Default constructor. |
| */ |
| protected AbstractDistribution() { |
| super(); |
| } |
| |
| /** |
| * For a random variable X whose values are distributed according |
| * to this distribution, this method returns P(x0 ≤ X ≤ x1). |
| * <p> |
| * The default implementation uses the identity</p> |
| * <p> |
| * P(x0 ≤ X ≤ x1) = P(X ≤ x1) - P(X ≤ x0) </p> |
| * |
| * @param x0 the (inclusive) lower bound |
| * @param x1 the (inclusive) upper bound |
| * @return the probability that a random variable with this distribution |
| * will take a value between <code>x0</code> and <code>x1</code>, |
| * including the endpoints. |
| * @throws MathException if the cumulative probability can not be |
| * computed due to convergence or other numerical errors. |
| * @throws IllegalArgumentException if <code>x0 > x1</code> |
| */ |
| public double cumulativeProbability(double x0, double x1) |
| throws MathException { |
| if (x0 > x1) { |
| throw MathRuntimeException.createIllegalArgumentException( |
| LocalizedFormats.LOWER_ENDPOINT_ABOVE_UPPER_ENDPOINT, |
| x0, x1); |
| } |
| return cumulativeProbability(x1) - cumulativeProbability(x0); |
| } |
| } |