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Java > Open Source Codes > org > apache > commons > math > distribution > DiscreteDistribution


1 /*
2  * Copyright 2003-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.math.distribution;
17
18
19 /**
20  * Base interface for discrete distributions.
21  *
22  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
23  */
24 public interface DiscreteDistribution extends Distribution {
25     /**
26      * For a random variable X whose values are distributed according
27      * to this distribution, this method returns P(X = x). In other words, this
28      * method represents the probability mass function, or PMF for the distribution.
29      *
30      * @param x the value at which the probability mass function is evaluated.
31      * @return the value of the probability mass function at x
32      */
33     double probability(double x);
34 }
35
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