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    1   /*
    2    * Copyright 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
    17  package org.apache.commons.math.distribution;
    18
    19  /***
    20   * Normal (Gauss) Distribution.
    21   * Instances of NormalDistribution objects should be created using
    22   * {@link DistributionFactory#createNormalDistribution(double, double)}.<p>
    23   *
    24   * <p>
    25   * References:<p>
    26   * <ul>
    27   * <li><a href="http://mathworld.wolfram.com/NormalDistribution.html">
    28   * Normal Distribution</a></li>
    29   * </ul>
    30   * </p>
    31   *
    32   * @version $Revision: 201915 $ $Date: 2005-06-26 15:20:57 -0700 (Sun, 26 Jun 2005) $
    33   */
    34  public interface NormalDistribution extends ContinuousDistribution {
    35      /***
    36       * Access the mean.
    37       * @return mean for this distribution
    38       */
    39      double getMean();
    40      /***
    41       * Modify the mean.
    42       * @param mean for this distribution
    43       */
    44      void setMean(double mean);
    45      /***
    46       * Access the standard deviation.
    47       * @return standard deviation for this distribution
    48       */
    49      double getStandardDeviation();
    50      /***
    51       * Modify the standard deviation.
    52       * @param sd standard deviation for this distribution
    53       */
    54      void setStandardDeviation(double sd);
    55  }