1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.math.distribution; 19 20 /** 21 * Normal (Gauss) Distribution. 22 * 23 * <p> 24 * References:</p><p> 25 * <ul> 26 * <li><a href="http://mathworld.wolfram.com/NormalDistribution.html"> 27 * Normal Distribution</a></li> 28 * </ul> 29 * </p> 30 * 31 * @version $Revision: 693598 $ $Date: 2008-09-09 16:37:08 -0400 (Tue, 09 Sep 2008) $ 32 */ 33 public interface NormalDistribution extends ContinuousDistribution, HasDensity<Double> { 34 /** 35 * Access the mean. 36 * @return mean for this distribution 37 */ 38 double getMean(); 39 /** 40 * Modify the mean. 41 * @param mean for this distribution 42 */ 43 void setMean(double mean); 44 /** 45 * Access the standard deviation. 46 * @return standard deviation for this distribution 47 */ 48 double getStandardDeviation(); 49 /** 50 * Modify the standard deviation. 51 * @param sd standard deviation for this distribution 52 */ 53 void setStandardDeviation(double sd); 54 55 /** 56 * Return the probability density for a particular point. 57 * @param x The point at which the density should be computed. 58 * @return The pdf at point x. 59 */ 60 double density(Double x); 61 }