fuzzydl.milp

Class Expression

java.lang.Object

fuzzydl.milp.Expression

public class Expression
extends java.lang.Object

Linear expression of the form c + c1 * x1 + c2 * x2 + ... + cN * xN

Author:

Fernando Bobillo

Constructor Summary

Constructors

Constructor and Description
Expression(double constant)
Expression(double constant, Term... terms)
Expression(Expression expr)
Expression(java.util.Set<Variable> v)
Expression(Term... terms)
Expression(java.util.Vector<Variable> v)

Method Summary

Modifier and Type	Method and Description
static Expression	addConstant(Expression expr, java.lang.Double constant) Adds a double constant to an expression.
static Expression	addExpressions(Expression expr1, Expression expr2) Adds two expressions.
static Expression	addTerm(Expression expr, Term term) Adds a term to an expression.
void	addTerm(Term term) Adds a term to an expression.
Expression	clone() Gets a copy of an expression.
double	getConstant() Gets the constant of the expression.
double	getConstantTerm(Variable var) Given a variable, gets its coefficient in the expression.
java.util.List<Term>	getTerms() Gets the terms of the expression.
void	incrementConstant() Increments the double constant in one.
static Expression	multiplyConstant(Expression expr, java.lang.Double constant) Multiplies a double constant and an expression.
static Expression	negateExpression(Expression expr) Changes the sign of all the elements of an expression.
void	setConstant(double constant) Sets a double constant to an expression.
static Expression	subtractExpressions(Expression expr1, Expression expr2) Substracts two expressions.
java.lang.String	toString() Gets a printable name of the expression.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Expression

public Expression(double constant)

Expression

public Expression(double constant,
                  Term... terms)

Expression

public Expression(Term... terms)

Expression

public Expression(Expression expr)

Expression

public Expression(java.util.Vector<Variable> v)

Expression

public Expression(java.util.Set<Variable> v)

Method Detail

clone

public Expression clone()

Gets a copy of an expression.

Overrides:

clone in class java.lang.Object

Returns:

A copy of the expression.

getTerms

public java.util.List<Term> getTerms()

Gets the terms of the expression.

Returns:

Terms of the expression.

getConstant

public double getConstant()

Gets the constant of the expression.

Returns:

Constant of the expression.

negateExpression

public static Expression negateExpression(Expression expr)

Changes the sign of all the elements of an expression.

Parameters:

expr - An expression.

Returns:

A new (negated) expression.

addConstant

public static Expression addConstant(Expression expr,
                                     java.lang.Double constant)

Adds a double constant to an expression.

Parameters:

expr - An expression.

constant - A double constant.

Returns:

A new expression with the sum.

setConstant

public void setConstant(double constant)

Sets a double constant to an expression.

Parameters:

constant - A double constant.

incrementConstant

public void incrementConstant()

Increments the double constant in one.

addTerm

public void addTerm(Term term)

Adds a term to an expression.

Parameters:

term - A term.

addTerm

public static Expression addTerm(Expression expr,
                                 Term term)

Adds a term to an expression.

Parameters:

expr - An expression.

term - A term.

Returns:

A new expression with the sum.

addExpressions

public static Expression addExpressions(Expression expr1,
                                        Expression expr2)

Adds two expressions.

Parameters:

expr1 - An expression.

expr2 - Another expression.

Returns:

A new expression with the sum.

subtractExpressions

public static Expression subtractExpressions(Expression expr1,
                                             Expression expr2)

Substracts two expressions.

Parameters:

expr1 - First expression.

expr2 - Second expression.

Returns:

A new expression with the sum.

multiplyConstant

public static Expression multiplyConstant(Expression expr,
                                          java.lang.Double constant)

Multiplies a double constant and an expression.

Parameters:

expr - An expression.

constant - A double constant.

Returns:

A new expression with the product.

getConstantTerm

public double getConstantTerm(Variable var)

Given a variable, gets its coefficient in the expression.

Parameters:

var - A variable.

Returns:

Coefficient in the expression.

toString

public java.lang.String toString()

Gets a printable name of the expression.

Overrides:

toString in class java.lang.Object

Returns:

Name of the expression.