| /* |
| * 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 org.apache.commons.math.MathException; |
| |
| /** |
| * Base interface for probability distributions. |
| * |
| * @version $Revision: 1054524 $ $Date: 2011-01-03 05:59:18 +0100 (lun. 03 janv. 2011) $ |
| */ |
| public interface Distribution { |
| /** |
| * For a random variable X whose values are distributed according |
| * to this distribution, this method returns P(X ≤ x). In other words, |
| * this method represents the (cumulative) distribution function, or |
| * CDF, for this distribution. |
| * |
| * @param x the value at which the distribution function is evaluated. |
| * @return the probability that a random variable with this |
| * distribution takes a value less than or equal to <code>x</code> |
| * @throws MathException if the cumulative probability can not be |
| * computed due to convergence or other numerical errors. |
| */ |
| double cumulativeProbability(double x) throws MathException; |
| |
| /** |
| * For a random variable X whose values are distributed according |
| * to this distribution, this method returns P(x0 ≤ X ≤ x1). |
| * |
| * @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> |
| */ |
| double cumulativeProbability(double x0, double x1) throws MathException; |
| |
| } |