/*
 * 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;

/**
 * Weibull Distribution.  This interface defines the two parameter form of the
 * distribution as defined by
 * <a href="http://mathworld.wolfram.com/WeibullDistribution.html">
 * Weibull Distribution</a>, equations (1) and (2).
 *
 * <p>
 * References:
 * <ul>
 * <li><a href="http://mathworld.wolfram.com/WeibullDistribution.html">
 * Weibull Distribution</a></li>
 * </ul>
 * </p>
 *
 * @since 1.1
 * @version $Revision: 613570 $ $Date: 2008-01-20 08:03:24 -0700 (Sun, 20 Jan 2008) $
 */
public interface WeibullDistribution extends ContinuousDistribution {

    /**
     * Access the shape parameter.
     * @return the shape parameter.
     */
    double getShape();
    
    /**
     * Access the scale parameter.
     * @return the scale parameter.
     */
    double getScale();
    
    /**
     * Modify the shape parameter.
     * @param alpha The new shape parameter value.
     */
    void setShape(double alpha);
    
    /**
     * Modify the scale parameter.
     * @param beta The new scale parameter value.
     */
    void setScale(double beta);
}