/*
 * 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 $Revision$ $Date$
 */
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);
}
