Initializing help system before first use

QuadTermList


  • public final class QuadTermList
    extends QuadExpression
    A quadratic expression that is represented as a list of terms. Instances of this class represent a quadratic expression as a list of terms. This is the most efficient way to represent a list. By default, the implementation assumes that there are no two terms in the list that refer to the same pair of variables. If there are you must either explicitly call compress() or set the autoCompress property to true.
    Since:
    43.00
    • Constructor Detail

      • QuadTermList

        public QuadTermList()
        Create a new empty expression.
        Since:
        43.00
      • QuadTermList

        public QuadTermList​(double c)
        Create a new expression that represents a constant term.
        Parameters:
        c - The constant term.
        Since:
        43.00
      • QuadTermList

        public QuadTermList​(double c,
                            int capacity)
        Create a new expression with a constant term and an initial capacity.
        Parameters:
        c - The constant term.
        capacity - The initial capacity.
        Since:
        43.00
    • Method Detail

      • setAutoCompress

        public static void setAutoCompress​(boolean compress)
        Enable/disable auto-compression for instances of this class. With auto-compression disabled, any instance of this class assumes that expressions do not contain two terms with the same pair of variables.
        Parameters:
        compress - true to enable, false otherwise.
        Since:
        43.00
      • isAutoCompress

        public static boolean isAutoCompress()
        Test whether auto-compression is enabled for this class.
        Returns:
        true if auto compression is enabled for all instances of this class.
        Since:
        43.00
      • deepCopy

        public QuadExpression deepCopy()
        Get a deep copy of this expression.
        Specified by:
        deepCopy in class  QuadExpression
        Returns:
        A deep copy of this expression.
        Since:
        43.00
      • deepCopy

        public QuadExpression deepCopy​(double factor)
        Get a deep copy of this expression multiplied by a constant
        Specified by:
        deepCopy in class  QuadExpression
        Parameters:
        factor - Factor to scale this with.
        Returns:
        A deep copy of this expression multiplied by factor.
        Since:
        43.00
      • reserve

        public QuadTermList reserve​(int l)
        Reserve a maximum number of elements in this expression.
        Parameters:
        l - The number of additional elements to reserve.
        Returns:
        Always returns this instance.
        Since:
        43.00
      • reset

        public QuadTermList reset()
        Clear this expression. Removes all terms and sets the constant to 0.
        Specified by:
        reset in class  QuadExpression
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(java.util.stream.Stream<Variable> variables,
                                     java.util.stream.Stream<java.lang.Double> coefficients)
        Add multiple linear terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables - Variables.
        coefficients - Coefficients.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(java.util.stream.Stream<Variable> variables1,
                                     java.util.stream.Stream<Variable> variables2,
                                     java.util.stream.Stream<java.lang.Double> coefficients)
        Add multiple quadratic terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables1, variables2 and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables1 - First variables.
        variables2 - Second variables.
        coefficients - Coefficients.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(java.lang.Iterable<Variable> variables,
                                     java.lang.Iterable<java.lang.Double> coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables - Variables
        coefficients - Coefficients
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(java.lang.Iterable<Variable> variables1,
                                     java.lang.Iterable<Variable> variables2,
                                     java.lang.Iterable<java.lang.Double> coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables1, variables2 and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables1 - First variables
        variables2 - Second variables
        coefficients - Coefficients
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(Variable[] variables,
                                     double[] coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables - Variables
        coefficients - Coefficients
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(Variable[] variables1,
                                     Variable[] variables2,
                                     double[] coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables1, variables2 and coefficients.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables1 - First variables
        variables2 - Second variables
        coefficients - Coefficients
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(Variable[] variables,
                                     double[] coefficients,
                                     int offset,
                                     int count)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables and coefficients using count elements starting from offset.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables - Variables
        coefficients - Coefficients
        offset - Offset into arrays.
        count - Number of elements to use from each array.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(Variable[] variables1,
                                     Variable[] variables2,
                                     double[] coefficients,
                                     int offset,
                                     int count)
        Add multiple terms to this expression. Adds the scalar product defined by the element-wise multiplication of variables1, variables2 and coefficients using count elements starting from offset.
        Overrides:
        addTerms in class  QuadExpression
        Parameters:
        variables1 - First variables
        variables2 - Second variables
        coefficients - Coefficients
        offset - Offset into arrays.
        count - Number of elements to use from each array.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(Variable variable,
                                    double coefficient)
        Add a term to this expression. If the expression already has a coefficient for variable then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        variable - Variable.
        coefficient - Coefficient to add for variable.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(double coefficient,
                                    Variable variable)
        Add a term to this expression. If the expression already has a coefficient for variable then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        coefficient - Coefficient to add for variable.
        variable - Variable.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(Variable x)
        Add term 1.0*x to this expression. If the expression already has a coefficient for x then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        x - Variable.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(Variable variable1,
                                    Variable variable2,
                                    double coefficient)
        Add a term to this expression. If the expression already has a coefficient for variable1*variable2 then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        variable1 - First variable.
        variable2 - Second variable.
        coefficient - Coefficient to add for variable1*variable2.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(double coefficient,
                                    Variable variable1,
                                    Variable variable2)
        Add a term to this expression. If the expression already has a coefficient for variable1*variable2 then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        coefficient - Coefficient to add for variable1*variable2.
        variable1 - First variable.
        variable2 - Second variable.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerm

        public QuadTermList addTerm​(Variable x1,
                                    Variable x2)
        Add term 1.0*x1*x2 to this expression. If the expression already has a coefficient for x then the old and the new coefficients will be added.
        Specified by:
        addTerm in class  QuadExpression
        Parameters:
        x1 - First variable.
        x2 - Second variable.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(LinExpression expr)
        Add another linear expression to this expression.
        Specified by:
        addTerms in class  QuadExpression
        Parameters:
        expr - The expression to add
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(QuadExpression expr)
        Add another quadratic expression to this expression.
        Specified by:
        addTerms in class  QuadExpression
        Parameters:
        expr - The expression to add
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(LinExpression expr,
                                     double factor)
        Add another linear expression to this expression.
        Specified by:
        addTerms in class  QuadExpression
        Parameters:
        expr - The expression to add.
        factor - Factor by which to multiply elements in expr before adding.
        Returns:
        Always returns this.
        Since:
        43.00
      • addTerms

        public QuadTermList addTerms​(QuadExpression expr,
                                     double factor)
        Add another quadratic expression to this expression.
        Specified by:
        addTerms in class  QuadExpression
        Parameters:
        expr - The expression to add.
        factor - Factor by which to multiply elements in expr before adding.
        Returns:
        Always returns this.
        Since:
        43.00
      • addConstant

        public QuadTermList addConstant​(double c)
        Add a value to the constant term of this expression.
        Specified by:
        addConstant in class  QuadExpression
        Parameters:
        c - The constant to add.
        Returns:
        Always returns this.
        Since:
        43.00
      • setConstant

        public QuadTermList setConstant​(double c)
        Set the constant term in this expression. Any existing constant term will be overwritten.
        Specified by:
        setConstant in class  QuadExpression
        Parameters:
        c - New constant term for this expression
        Returns:
        Always returns this.
        Since:
        43.00
      • getConstant

        public double getConstant()
        Get the constant value in this expression.
        Specified by:
        getConstant in class  QuadExpression
        Returns:
        The constant value in this expression.
        Since:
        43.00
      • compress

        public void compress()
        Compress duplicate terms. Sorts the terms and merges any terms for the same variable into a single term.
        Since:
        43.00
      • extract

        public boolean extract​(double factor,
                               XPRSprob.RowCreator creator)
        Parameters:
        factor -
        creator -
        Returns:
        Since:
        43.00
      • evaluate

        public double evaluate​(double[] solution)
        Compute the value of this expression with respect to the given solution vector (which is not required to be feasible).
        Specified by:
        evaluate in class  Expression
        Parameters:
        solution - Solution values for which the expression is evaluated.
        Returns:
        The value of this expression evaluated at solution.
        Since:
        43.00
      • toString

        public java.lang.String toString()
        Overrides:
        toString in class  java.lang.Object
        Returns:
        Since:
        43.00

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