Package org.apache.commons.math4.legacy.optim.linear

Enum PivotSelectionRule

java.lang.Object

java.lang.Enum<PivotSelectionRule>

org.apache.commons.math4.legacy.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	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

Modifier and Type	Method	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