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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  package org.apache.commons.math.analysis;
17  
18  /**
19   * Extension of {@link UnivariateRealFunction} representing a differentiable univariate real function.
20   *
21   * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
22   */
23  public interface DifferentiableUnivariateRealFunction
24      extends UnivariateRealFunction {
25   
26      /**
27       * Returns the derivative of the function
28       * 
29       * @return  the derivative function
30       */
31      public UnivariateRealFunction derivative();
32  
33  }