org.apache.commons.math3.optim.linear

## Enum PivotSelectionRule

- java.lang.Object
- - java.lang.Enum<PivotSelectionRule>
  - - org.apache.commons.math3.optim.linear.PivotSelectionRule

- All Implemented Interfaces:
    Serializable, Comparable<PivotSelectionRule>, OptimizationData

      public enum PivotSelectionRule
      extends Enum<PivotSelectionRule>
      implements OptimizationData

  Pivot selection rule to the use for a Simplex solver.
  Since:
    3.3

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `BLAND` The first variable with a negative coefficient in the objective function row will be chosen as entering variable.
    `DANTZIG` The classical rule, the variable with the most negative coefficient in the objective function row will be chosen as entering variable.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static PivotSelectionRule` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static PivotSelectionRule[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

    - ### Methods inherited from class java.lang.Enum

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### DANTZIG

          public static final PivotSelectionRule DANTZIG

      The classical rule, the variable with the most negative coefficient in the objective function row will be chosen as entering variable.

    - #### BLAND

          public static final PivotSelectionRule BLAND

      The first variable with a negative coefficient in the objective function row will be chosen as entering variable. This rule guarantees to prevent cycles, but may take longer to find an optimal solution.

  - ### Method Detail

    - #### values

          public static PivotSelectionRule[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (PivotSelectionRule c : PivotSelectionRule.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static PivotSelectionRule valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

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