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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    *      https://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  /*
19   * This is not the original file distributed by the Apache Software Foundation
20   * It has been modified by the Hipparchus project
21   */
22  package org.hipparchus.optim.linear;
23  
24  import org.hipparchus.optim.OptimizationData;
25  
26  /**
27   * Pivot selection rule to the use for a Simplex solver.
28   *
29   */
30  public enum PivotSelectionRule implements OptimizationData {
31      /**
32       * The classical rule, the variable with the most negative coefficient
33       * in the objective function row will be chosen as entering variable.
34       */
35      DANTZIG,
36      /**
37       * The first variable with a negative coefficient in the objective function
38       * row will be chosen as entering variable. This rule guarantees to prevent
39       * cycles, but may take longer to find an optimal solution.
40       */
41      BLAND
42  }