8.5.11. MDOQuadExpr¶

class MDOQuadExpr¶

Represent a quadratic expression in MindOpt application. A quadratic expression has quadratic terms plus a linear expression.

Methods

`MDOQuadExpr`	Construct a quadratic expression with a constant value
`MDOQuadExpr`	Construct a quadratic expression with a linear term
`MDOQuadExpr`	Construct a quadratic expression with a linear expression
`add`	Add a linear expression to this quadratic expression
`addConstant`	Add a value to the constant contained in quadratic expression
`addTerm`	Add a linear term to this quadratic expression
`addTerm`	Add a quadratic term to this quadratic expression
`addTerms`	Add linear terms to this quadratic expression
`addTerms`	Add quadratic terms to this quadratic expression
`clear`	Clear all terms contained in quadratic expression and reset constant to zero
`getCoeff`	Retrieve the coefficient of the ith quadratic term
`getLinExpr`	Retrieve the linear expression contained in quadratic term
`getValue`	Calculate the value of this quadratic expression after problem was solved
`getVar1`	Retrieve the first variable of the ith quadratic term
`getVar2`	Retrieve the second variable of the ith quadratic term
`remove`	Remove the ith quadratic term from this quadratic expression
`remove`	Remove all terms (include linear terms and quadratic terms) containing a specified variable
`size`	Retrieve the number of quadratic terms contained in this quadratic expression

MDOQuadExpr(double constant = 0.0)¶

Construct a quadratic expression with a constant value.

Parameters: double constant=0.0 – The initial constant value.

MDOQuadExpr(MDOVar var, double coeff = 1.0)¶

Construct a quadratic expression with a linear term.

Parameters

MDOVar var – The variable of linear term.
double coeff=1.0 – The coefficient of linear term.

MDOQuadExpr(const MDOLinExpr &le)¶

Construct a quadratic expression with a linear expression.

Parameters: const MDOLinExpr& le – The initial linear expression.

void add(const MDOLinExpr le)¶

Add a linear expression to this quadratic expression.

Parameters: const MDOLinExpr le – The linear expression to be added.

void addConstant(double c)¶

Add a value to the constant contained in quadratic expression.

Parameters: double c – The value to be added.

void addTerm(double coeff, MDOVar var)¶

Add a linear term to this quadratic expression.

Parameters

double coeff – The coefficient of linear term to be added.
MDOVar var – The variable of linear term to be added.

void addTerm(double coeff, MDOVar var1, MDOVar var2)¶

Add a quadratic term to this quadratic expression.

Parameters

double coeff – The coefficient of quadratic term to be added.
MDOVar var1 – The first variable of quadratic term to be added.
MDOVar var2 – The second variable of quadratic term to be added.

void addTerms(const double *coeff, const MDOVar *var, int cnt)¶

Add linear terms to this quadratic expression.

Parameters

const double* coeff – The coefficients of linear terms to be added.
const MDOVar* var – The variables of linear terms to be added.
int cnt – The number of linear terms to be added.

void addTerms(const double *coeff, const MDOVar *var1, const MDOVar *var2, int cnt)¶

Add quadratic terms to this quadratic expression.

Parameters

const double* coeff – The coefficients of quadratic terms to be added.
const MDOVar* var1 – The first variables of quadratic terms to be added.
const MDOVar* var2 – The second variables of quadratic terms to be added.
int cnt – The number of quadratic terms to be added.

void clear()¶: Clear all terms contained in quadratic expression and reset constant to zero.

double getCoeff(int i)¶

Retrieve the coefficient of the ith quadratic term.

Parameters: int i – The index of quadratic term.
Returns: The coefficient of the ith quadratic term.

MDOLinExpr getLinExpr()¶

Retrieve the linear expression contained in quadratic term.

Returns: The linear expression contained in quadratic term.

double getValue()¶

Calculate the value of this quadratic expression after problem was solved.

Returns: The value of this quadratic expression after problem was solved.

MDOVar getVar1(int i)¶

Retrieve the first variable of the ith quadratic term.

Parameters: int i – The index of quadratic term.
Returns: The first variable of the ith quadratic term.

MDOVar getVar2(int i)¶

Retrieve the second variable of the ith quadratic term.

Parameters: int i – The index of quadratic term.
Returns: The second variable of the ith quadratic term.

void remove(int i)¶

Remove the ith quadratic term from this quadratic expression.

Parameters: int i – The index of quadratic term to be removed.

bool remove(MDOVar v)¶

Remove all terms (include linear terms and quadratic terms) containing a specified variable.

Parameters: MDOVar v – The variable contained to be removed.
Returns: True if at least 1 term was removed.

int size()¶

Retrieve the number of quadratic terms contained in this quadratic expression.

Returns: The number of quadratic terms contained in this quadratic expression.