8.6.14. MDOLinExpr

MDOLinExpr

Represents a linear expression in a MindOpt application. A linear expression can contain linear terms and a constant.

Methods

MDOLinExpr	Construct a MDOLinExpr with an existing MDOLinExpr
add	Add another linear term to the current linear term
addConstant	Add a value to the constant contained in the linear expression
addTerm	Add a linear term to this linear expression
addTerms	Add linear terms to this linear expression
addTerms	Add linear terms to this linear expression
clear	Clear this linear expression to delete all items and reset its constants to zero
getCoeff	Retrieve the coefficient contained in the ith linear term
getConstant	Retrieve the value of the constant contained in the linear expression
getValue	Calculate the value of this linear expression after the problem is solved
getVar	Retrieve the variable contained in the ith linear term
multAdd	Add a constant multiple of another linear term to the current linear term
remove	Remove a linear term from this linear expression by its index
remove	Remove all linear terms containing a specified variable
size	Retrieve the total number of linear terms contained in a linear expression
toString	Convert the current linear term to its String format

MDOLinExpr(MDOLinExpr le)

Construct a MDOLinExpr with an existing MDOLinExpr.

Parameters

MDOLinExpr le – Existing MDOLinExpr.

void add(MDOLinExpr le)

Add another linear term to the current linear term.

Parameters

MDOLinExpr le – Added linear term.

void addConstant(double c)

Add a value to the constant contained in the linear expression.

Parameters

double c – The value to be added.

void addTerm(double coeff, MDOVar var)

Add a linear term to this linear expression

Parameters

• double coeff – Coefficient of the term to be added

• MDOVar var – The variable of the term to be added

void addTerms(double[] coeff, MDOVar[] var)

Add linear terms to this linear expression.

Parameters

• double[] coeff – The coefficients of the terms to be added.

• MDOVar[] var – The variables of the terms to be added.

void addTerms(double[] coeff, MDOVar[] var, int start, int len)

Add linear terms to this linear expression.

Parameters

• double[] coeff – Coefficients of the terms to be added.

• MDOVar[] var – The variables of the terms to be added.

• int start – Start position.

• int len – The number of items to add.

void clear()

Clear this linear expression to delete all items and reset its constants to zero.

double getCoeff(int i)

Retrieve the coefficient contained in the ith linear term.

Parameters

int i – The index of linear term.

Returns

Coefficient contained in the ith linear term.

double getConstant()

Retrieve the value of the constant contained in the linear expression.

Returns

The value of the constant contained in the linear expression.

double getValue()

Calculate the value of this linear expression after the problem is solved.

Returns

The value of this linear expression.

MDOVar getVar(int i)

Retrieve the variable contained in the ith linear term.

Parameters

int i – The index of the linear term.

Returns

The variable contained in the ith linear term.

void multAdd(double m, MDOLinExpr le)

Add a constant multiple of another linear term to the current linear term.

Parameters

• double m – Constant multiplier.

• MDOLinExpr le – The linear term to be added.

void remove(int i)

Remove a linear term from this linear expression by its index.

Parameters

int i – The index of the item to be removed.

boolean remove(MDOVar v)

Remove all linear terms containing a specified variable.

Parameters

MDOVar v – The contained variable to be removed.

Returns

True if at least 1 term was removed.

int size()

Retrieve the total number of linear terms contained in a linear expression

Returns

The total number of linear terms

String toString()

Convert the current linear term to its String format.

Returns

The String format of the linear term.