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 */ 017 018 package org.apache.commons.math.distribution; 019 020 /** 021 * Normal (Gauss) Distribution. 022 * 023 * <p> 024 * References:</p><p> 025 * <ul> 026 * <li><a href="http://mathworld.wolfram.com/NormalDistribution.html"> 027 * Normal Distribution</a></li> 028 * </ul> 029 * </p> 030 * 031 * @version $Revision: 693598 $ $Date: 2008-09-09 16:37:08 -0400 (Tue, 09 Sep 2008) $ 032 */ 033 public interface NormalDistribution extends ContinuousDistribution, HasDensity<Double> { 034 /** 035 * Access the mean. 036 * @return mean for this distribution 037 */ 038 double getMean(); 039 /** 040 * Modify the mean. 041 * @param mean for this distribution 042 */ 043 void setMean(double mean); 044 /** 045 * Access the standard deviation. 046 * @return standard deviation for this distribution 047 */ 048 double getStandardDeviation(); 049 /** 050 * Modify the standard deviation. 051 * @param sd standard deviation for this distribution 052 */ 053 void setStandardDeviation(double sd); 054 055 /** 056 * Return the probability density for a particular point. 057 * @param x The point at which the density should be computed. 058 * @return The pdf at point x. 059 */ 060 double density(Double x); 061 }