Class VariableCollection<T, T2>

This is a strongly typed helper class that allows you to model your Variables more intuitively

It groups variable with the same meaning. In a mathematical model a VariableCollection is represented by a single symbol (like x); a variable by a symbol with indices (like x_{i,j}). Some (optional) generators are used to calculate parameters for each of the VariableCollection's variable:

  • DebugNameGenerator

  • LowerBoundGenerator

  • UpperBoundGenerator

  • VariableTypeGenerator

  • BranchingPriorityGenerator

Inheritance
System.Object
GenericVariableCollectionBase<VariableCollection<T, T2>>
VariableCollection<T, T2>
Inherited Members
System.Object.ToString()
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: OPTANO.Modeling.Optimization
Assembly: Optimization.dll
Syntax
public class VariableCollection<T, T2> : GenericVariableCollectionBase<VariableCollection<T, T2>>, IInternalVariableCollection, IVariableCollection
Type Parameters
Name Description
T

Element type for the 1st index set.
T2

Element type for the 2nd index set.

Constructors

VariableCollection(Model, IEnumerable<T>, IEnumerable<T2>, String, Func<T, T2, String>, Func<T, T2, Double>, Func<T, T2, Double>, Func<T, T2, VariableType>, Func<T, T2, Nullable<Int32>>, Func<T, T2, BranchingDirection>)

Initializes a new instance of the VariableCollection<T, T2> class. Initializes a new instance of the VariableCollection<T, T2> class.

Declaration
public VariableCollection(Model model, IEnumerable<T> indexSet1, IEnumerable<T2> indexSet2, string name = "", Func<T, T2, string> debugNameGenerator = null, Func<T, T2, double> lowerBoundGenerator = null, Func<T, T2, double> upperBoundGenerator = null, Func<T, T2, VariableType> variableTypeGenerator = null, Func<T, T2, int? > branchingPriorityGenerator = null, Func<T, T2, BranchingDirection> branchingDirectionGenerator = null)
Parameters
Type Name Description
Model model

The Model this VariableCollection<T, T2> belongs to. A VariableCollection<T, T2> needs to belong to exactly one Model.
System.Collections.Generic.IEnumerable<T> indexSet1

The index set with elements of type T
System.Collections.Generic.IEnumerable<T2> indexSet2

The index set with elements of type T2
System.String name

The name for this variable collection. It must be unique among all VariableCollections that are used in the given model. If name equals System.String.IsNullOrWhiteSpace(System.String), a base64 index will be generated automatically.
System.Func<T, T2, System.String> debugNameGenerator

A function that takes an index for the VariableCollection<T, T2> and produces a System.String as output. The generator will be used when NameHandling is set to UniqueLongNames. The System.String that is produced by the delegate will be prepended to the unique variable name. The objective is to make the generated Model more readable, especially when trying to fix bugs. By default, the NameHandling is set to UniqueShortNames in order to reduce the amount of RAM required to store variable names.
System.Func<T, T2, System.Double> lowerBoundGenerator

A function that takes an index for the VariableCollection<T, T2> and defines a lower bound for the respective Variable. If the generator is null, 0 will be used as default lower bound for every variable.
System.Func<T, T2, System.Double> upperBoundGenerator

A function that takes an index for the VariableCollection<T, T2> and defines an upper bound for the respective Variable. If the generator is null, double.PositiveInfinity will be used as default upper bound for every non-binary variable. For Binary variables, 1 will be used as upper bound.
System.Func<T, T2, VariableType> variableTypeGenerator

A function that takes an index for the VariableCollection<T, T2> and defines a VariableType for the respective Variable. For all Binary variables, the bounds need to be in the range of [0, 1].
System.Func<T, T2, System.Nullable<System.Int32>> branchingPriorityGenerator

A function that takes an element from each index set and returns the branching priority as integer (or null, if default priority shall be used).
System.Func<T, T2, BranchingDirection> branchingDirectionGenerator

A function that takes an element from each index set and returns the branching priority as integer (or null, if default priority shall be used).

Properties

ExistingIndicesGeneric

Returns all existing indices as generically typed index object.

Declaration
public IEnumerable<GenericVariableCollectionIndex<T, T2>> ExistingIndicesGeneric { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<GenericVariableCollectionIndex<T, T2>>

Item[T, T2]

Gets the Variable with the specified index.

Declaration
public Variable this[T element1, T2 element2] { get; }
Parameters
Type Name Description
T element1

Element of the index 1st index set.
T2 element2

Element of the index 2nd index set.
Property Value
Type Description
Variable

The variable for the given index

Item[GenericVariableCollectionIndex<T, T2>]

Gets the Variable with the specified index.

Declaration
public Variable this[GenericVariableCollectionIndex<T, T2> index] { get; }
Parameters
Type Name Description
GenericVariableCollectionIndex<T, T2> index

All index elements combined in a single tuple.
Property Value
Type Description
Variable

Methods

CreateTypedInstance(VariableCollection)

Declaration
protected override VariableCollection<T, T2> CreateTypedInstance(VariableCollection internalCollection)
Parameters
Type Name Description
VariableCollection internalCollection
Returns
Type Description
VariableCollection<T, T2>
Overrides
OPTANO.Modeling.Optimization.GenericVariableCollectionBase<OPTANO.Modeling.Optimization.VariableCollection<T, T2>>.CreateTypedInstance(OPTANO.Modeling.Optimization.VariableCollection)

IsVariableForIndexInstanciated(GenericVariableCollectionIndex<T, T2>)

Checks if a variable was created for the given index.

Declaration
public bool IsVariableForIndexInstanciated(GenericVariableCollectionIndex<T, T2> genericIndex)
Parameters
Type Name Description
GenericVariableCollectionIndex<T, T2> genericIndex

The index.
Returns
Type Description
System.Boolean

True, if a variable was created.

Extension Methods