    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.math.distribution;
    018
    019    /**
    020     * The Gamma Distribution.
    021     *
    022     * <p>
    023     * References:
    024     * <ul>
    025     * <li><a href="http://mathworld.wolfram.com/GammaDistribution.html">
    026     * Gamma Distribution</a></li>
    027     * </ul>
    028     * </p>
    029     *
    030     * @version $Revision: 920852 $ $Date: 2010-03-09 13:53:44 +0100 (mar. 09 mars 2010) $
    031     */
    032    public interface GammaDistribution extends ContinuousDistribution, HasDensity<Double> {
    033        /**
    034         * Modify the shape parameter, alpha.
    035         * @param alpha the new shape parameter.
    036         * @deprecated as of v2.1
    037         */
    038        @Deprecated
    039        void setAlpha(double alpha);
    040
    041        /**
    042         * Access the shape parameter, alpha
    043         * @return alpha.
    044         */
    045        double getAlpha();
    046
    047        /**
    048         * Modify the scale parameter, beta.
    049         * @param beta the new scale parameter.
    050         * @deprecated as of v2.1
    051         */
    052        @Deprecated
    053        void setBeta(double beta);
    054
    055        /**
    056         * Access the scale parameter, beta
    057         * @return beta.
    058         */
    059        double getBeta();
    060
    061        /**
    062         * Return the probability density for a particular point.
    063         * @param x  The point at which the density should be computed.
    064         * @return  The pdf at point x.
    065         */
    066        double density(Double x);
    067    }