Expressions

class Expression

Container for expressions in equations.

This class is the core container for expressions that appear in objectives and constraints.

Public Functions

Expression()

Constructs an Expression without defining its value

explicit Expression(double value)

Explict construction of an Expression from a double

explicit Expression(int value)

Explict construction of an Expression from an integer

Expression(const Parameter &arg)

Implicit construction of an Expression from a Parameter

Expression(const IndexParameter &arg)

Implicit construction of an Expression from an IndexParameter

Expression(const Variable &arg)

Implicit construction of an Expression from a Variable

Expression(const SubExpression &arg)

Implicit construction of an Expression from a SubExpression

bool is_constant() const

Returns:

true if this is a constant expression

double value() const

Note

The expression value is computed from the expression tree using values for the associated Parameter and Variable objects.

Returns:

the value of the expression

std::list<std::string> to_list() const

Returns:

a list representation of the expression

Expression diff(const Variable &var) const

Create an expression that computes the partial derivative relative to a specified variable.

Parameters:

var – - The variable that will be used to compute the partial derivative

Returns:

an expression that computes the partial derivative

Expression &operator+=(int arg)

Add an integer to the expression

Expression &operator+=(double arg)

Add a double to the expression

Expression &operator+=(const Parameter &arg)

Add a Parameter to the expression

Expression &operator+=(const IndexParameter &arg)

Add an IndexParameter to the expression

Expression &operator+=(const Variable &arg)

Add a Variable to the expression

Expression &operator+=(const Expression &arg)

Add an Expression to the expression

Expression &operator-=(int arg)

Subtract an integer from the expression

Expression &operator-=(double arg)

Subtract a double from the expression

Expression &operator-=(const Parameter &arg)

Subtract a Parameter from the expression

Expression &operator-=(const IndexParameter &arg)

Subtract an IndexParameter from the expression

Expression &operator-=(const Variable &arg)

Subtract a Variable from the expression

Expression &operator-=(const Expression &arg)

Subtract an Expression from the expression

Expression &operator*=(int arg)

Multiply the expression by an integer

Expression &operator*=(double arg)

Multiply the expression by a double

Expression &operator*=(const Parameter &arg)

Multiply the expression by a Parameter

Expression &operator*=(const IndexParameter &arg)

Multiply the expression by an IndexParameter

Expression &operator*=(const Variable &arg)

Multiply the expression by a Variable

Expression &operator*=(const Expression &arg)

Multiply the expression by an Expression

Expression &operator/=(int arg)

Divide the expression by an integer

Expression &operator/=(double arg)

Divide the expression by a double

Expression &operator/=(const Parameter &arg)

Divide the expression by a Parameter

Expression &operator/=(const IndexParameter &arg)

Divide the expression by an IndexParameter

Expression &operator/=(const Variable &arg)

Divide the expression by a Variable

Expression &operator/=(const Expression &arg)

Divide the expression by an Expression

Expression expand()

Returns:

an expanded Expression