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    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: 1.17 $ $Date: 2004/11/07 03:32:48 $
    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  }