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AbstractExpression Class

Default implementation of expressions.
Inheritance Hierarchy
System.Object
   Optimizer.Objects.Expression
     Optimizer.Objects.AbstractExpression
       More...

Namespace:   Optimizer.Objects
Assembly:  xprsdn (in xprsdn.dll) Version: 44.01.04
Syntax
C# 
public abstract class AbstractExpression : Expression

The AbstractExpression type exposes the following members.

Constructors
  Name Description
Protected method AbstractExpression
Initializes a new instance of the AbstractExpression class
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Methods
  Name Description
Public method Div(Double)
Create a new expression that represents the quotient of this and arg.
(Inherited from Expression.)
Public method Div(Expression)
Create a new expression that represents the quotient of this and arg.
(Inherited from Expression.)
Public method Eq(Double)
Create an "equals" constraint with this expression as left-hand side.
(Overrides Expression.Eq(Double).)
Public method Eq(Expression)
Create an "equals" constraint with this expression as left-hand side.
(Overrides Expression.Eq(Expression).)
Public method Equals
Determines whether the specified Object is equal to the current Object.
(Inherited from Object.)
Public method Evaluate
Compute the value of this expression with respect to the given solution Vector (which is not required to be feasible).
(Inherited from Expression.)
Public method Extract(Double, IPostfixExtractor)
Extract this expression into postfix notation.
(Inherited from Expression.)
Public method Extract(Double, XPRSprob.RowCreator)
Extract this expression into a row. This is for internal use only, you should never have to call this function explicitly.
(Inherited from Expression.)
Protected method Finalize
Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection.
(Inherited from Object.)
Public method Geq(Double)
Create a "greater than or equal" constraint with this expression as left-hand side.
(Overrides Expression.Geq(Double).)
Public method Geq(Expression)
Create a "greater than or equal" constraint with this expression as left-hand side.
(Overrides Expression.Geq(Expression).)
Public method GetConstantView
Get the constant value to which this expression evaluates. If this expression can be treated as a constant value then the function returns the constant value. If the expression cannot be treated as a constant then an exception is raised. In order to test whether the expression can be treated as constant, use function .GetMaxDegree() and check whether it returns 0.
(Overrides Expression.GetConstantView().)
Public method GetHashCode
Serves as a hash function for a particular type.
(Inherited from Object.)
Public method GetLinearView
Get a linear read-only view on this expression. If this expression can be treated as a linear expression then the function returns a readonly view on the linear terms (including the constant term if there is any). If the expression cannot be treated as a linear expression then an exception is raised. In order to test this expression can be treated as linear, use function .GetMaxDegree() and check whether it returns 0 or 1. In the returned System.Collections.Generic.KeyValuePair instances the constant term is indicated with a key of Optimizer.Objects.XpressProblem.NULL_VARIABLE. Note that depending on the actual expression class and its implementation, the terms may not be presented in the same order in which you added them. There may also be multiple elements with the same key (again depending on the implementation of the actual object).
(Overrides Expression.GetLinearView().)
Public method GetMaxDegree
Get the maximum degree of any of the terms/monomials that appear in the symbolic representation of all parenthesized sub-expressions are fully expanded. The maximum degree is
  • 0 for constant expressions.
  • 1 for linear expressions.
  • 2 for quadratic expressions.
  • Int32.MaxValue for function calls or formulas.
(Inherited from Expression.)
Public method GetQuadView
Get a quadratic read-only view on this expression. If this expression can be treated as a quadratic expression then the function returns a readonly view on the quadratic terms (including the constant term and linear terms if there are any). If the expression cannot be treated as a linear expression then an exception is raised. In order to test this expression can be treated as quadratic, use function .GetMaxDegree() and check whether it returns 0, 1, or 2. In the returned System.Collections.Generic.KeyValuePair instances the constant term is indicated with a key with two Optimizer.Objects.XpressProblem.NULL_VARIABLEs. Linear terms are represented by a QPair with Optimizer.Objects.XpressProblem.NULL_VARIABLE as second variable. Note that depending on the actual expression class and its implementation, the terms may not be presented in the same order in which you added them. There may also be multiple elements with the same key (again depending on the implementation of the actual object).
(Overrides Expression.GetQuadView().)
Public method GetRTTI
Get runtime type identification.
(Inherited from Expression.)
Public method GetType
Gets the Type of the current instance.
(Inherited from Object.)
Public method In
Create a range constraint that bounds this expression from below and above.
(Overrides Expression.In(Double, Double).)
Public method Leq(Double)
Create a "less than or equal" constraint with this expression as left-hand side.
(Overrides Expression.Leq(Double).)
Public method Leq(Expression)
Create a "less than or equal" constraint with this expression as left-hand side.
(Overrides Expression.Leq(Expression).)
Protected method MemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Public method Minus(Double)
Create a new expression that represents the difference of this and arg.
(Inherited from Expression.)
Public method Minus(Expression)
Create a new expression that represents the difference of this and arg.
(Inherited from Expression.)
Public method Mul(Double)
Create a new expression that represents the product of this and arg.
(Inherited from Expression.)
Public method Mul(Expression)
Create a new expression that represents the product of this and arg.
(Inherited from Expression.)
Public method Plus(Double)
Create a new expression that represents the sum of this and arg.
(Inherited from Expression.)
Public method Plus(Expression)
Create a new expression that represents the sum of this and arg.
(Inherited from Expression.)
Public method ToString
Returns a String that represents the current Object.
(Inherited from Object.)
Public method Uminus
Create a new expression that represents the unary minus of this one.
(Inherited from Expression.)
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See Also
Inheritance Hierarchy
Covered Topics
Parent Topic Optimizer.Objects

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