Initializing help system before first use

LinTermMap

  • public final class LinTermMap
extends LinExpression
    A linear expression. This class implements a linear expression as a map from variables to values.
    Since:
    43.00

    • Constructor Detail

      • LinTermMap

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

      • LinTermMap

        public LinTermMap​(double constant)
        Create an expression with a constant term.
        Parameters:
        constant - Constant term in new expression.
        Since:
        43.00

    • Method Detail

      • deepCopy

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

      • deepCopy

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

      • reset

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

      • addTerms

        public LinExpression addTerms​(java.util.Collection<Variable> variables,
                              java.util.Collection<java.lang.Double> coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the two parallel collections to this expression.
        Specified by:
        addTerms in class  LinExpression
        Parameters:
        variables - Variables.
        coefficients - Coefficients.
        Returns:
        Always returns this.
        Since:
        43.00

      • addTerms

        public LinExpression addTerms​(Variable[] variables,
                              double[] coefficients)
        Add multiple terms to this expression. Adds the scalar product defined by the two parallel arrays to this expression. This function is equivalent to 
          for (int i = 0; i < variables.length; ++i) addTerm(variables[i], coefficients[i]);
        Specified by:
        addTerms in class  LinExpression
        Parameters:
        variables - Variables
        coefficients - Coefficients
        Returns:
        Always returns this.
        Since:
        43.00

      • addTerm

        public LinExpression 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  LinExpression
        Parameters:
        variable - Variable.
        coefficient - Coefficient to add for variable.
        Returns:
        Always returns this.
        Since:
        43.00

      • addTerm

        public LinExpression 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  LinExpression
        Parameters:
        coefficient - Coefficient to add for variable.
        variable - Variable.
        Returns:
        Always returns this.
        Since:
        43.00

      • addTerm

        public LinExpression addTerm​(Variable x)
        Add term 1*x 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  LinExpression
        Parameters:
        x - Variable.
        Returns:
        Always returns this.
        Since:
        43.00

      • addTerms

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

      • addTerms

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

      • setCoefficient

        public LinTermMap setCoefficient​(Variable variable,
                                 double coefficient)
        Set the coefficient for a variable in this expression. Any existing coefficient will be overwritten.
        Parameters:
        variable - Variable index.
        coefficient - New coefficient for variable.
        Returns:
        Always returns this.
        Since:
        43.00

      • getCoefficient

        public double getCoefficient​(Variable variable)
        Get the coefficient for a variable.
        Parameters:
        variable - Variable to query.
        Returns:
        The coefficient for variable in this expression.
        Since:
        43.00

      • addConstant

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

      • setConstant

        public LinExpression setConstant​(double constant)
        Set the constant term in this expression. Any existing constant term will be overwritten.
        Specified by:
        setConstant in class  LinExpression
        Parameters:
        constant - 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  LinExpression
        Returns:
        The constant value in this expression.
        Since:
        43.00

      • extract

        public boolean extract​(double factor,
                       XPRSprob.RowCreator creator)
        Extract this expression into a row. This is for internal use only, you should never have to call this function explicitly.
        Specified by:
        extract in class  Expression
        Parameters:
        factor - Factor by which to multiply the expression during extraction.
        creator - The creator to which this expression should be extracted.
        Returns:
        true if the low-level representation does requires normalization (sorting, removal of dups, ...). In some special cases we know that this is not required and can return false to save the overhead.
        Since:
        43.00

      • extract

        public void extract​(double factor,
                    PostfixExtractor extractor)
        Extract this expression into postfix notation.
        Specified by:
        extract in class  Expression
        Parameters:
        factor - Factor by which to multiply the expression during extraction.
        extractor - The extractor to which the expression is extract.
        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.
        Since:
        43.00
Parent Topic Class Summary

© 2001-2024 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.