XPRBexpr

java.lang.Object
- com.dashoptimization.XPRBexpr

All Implemented Interfaces:

java.lang.AutoCloseable, java.lang.Cloneable

Direct Known Subclasses:

XPRBlinExp, XPRBquadExp, XPRBrelation
```
public class XPRBexpr
extends java.lang.Object
implements java.lang.Cloneable, java.lang.AutoCloseable
```
This class represents an expression in BCL. All variables in an expression must belong to the same problem.

Constructor Summary

Constructor and Description
`XPRBexpr()`
`XPRBexpr(double d)`
`XPRBexpr(double d, XPRBvar v)` Create an expression.
`XPRBexpr(double d, XPRBvar v1, XPRBvar v2)` Create a quadratic expression.
`XPRBexpr(XPRBvar v)`
`XPRBexpr(XPRBvar v, double d)`
`XPRBexpr(XPRBvar v1, XPRBvar v2)`
`XPRBexpr(XPRBvar v1, XPRBvar v2, double d)`

Method Summary

Modifier and Type	Method and Description
`XPRBexpr`	`add(double val)`
`static XPRBexpr`	`add(double val, XPRBexpr l)`
`XPRBexpr`	`add(XPRBexpr l)` Add an expression to an expression.
`static XPRBexpr`	`add(XPRBexpr l, double val)`
`static XPRBexpr`	`add(XPRBexpr l1, XPRBexpr l2)` Create the sum of two expressions.
`static XPRBexpr`	`add(XPRBexpr l, XPRBvar v)`
`XPRBexpr`	`add(XPRBvar v)`
`static XPRBexpr`	`add(XPRBvar v, XPRBexpr l)`
`XPRBexpr`	`addTerm(double val)`
`XPRBexpr`	`addTerm(double val, XPRBvar var)`
`XPRBexpr`	`addTerm(double val, XPRBvar var1, XPRBvar var2)`
`XPRBexpr`	`addTerm(XPRBvar var)`
`XPRBexpr`	`addTerm(XPRBvar var, double val)` Add a linear term to an expression.
`XPRBexpr`	`addTerm(XPRBvar var1, XPRBvar var2, double val)` Add a quadratic term to an expression.
`XPRBexpr`	`assign(XPRBexpr l)` Assign an expression.
`java.lang.Object`	`clone()` Make a copy of an expression.
`void`	`close()`
`XPRBexpr`	`delTerm(XPRBvar var)` Delete a term from an expression.
`XPRBexpr`	`delTerm(XPRBvar var1, XPRBvar var2)` Delete a quadratic term from an expression.
`XPRBrelation`	`eql(double val)`
`XPRBrelation`	`eql(XPRBexpr l)` Create a relation of type "equal".
`XPRBrelation`	`eql(XPRBvar v)`
`XPRBrelation`	`gEql(double val)`
`XPRBrelation`	`gEql(XPRBexpr l)` Create a relation of type "greater or equal".
`XPRBrelation`	`gEql(XPRBvar v)`
`double`	`getSol()` Get the evaluation of an expression with the current solution.
`int`	`getStatus()` Get the status of an expression
`XPRBrelation`	`lEql(double val)`
`XPRBrelation`	`lEql(XPRBexpr l)` Create a relation of type "less or equal".
`XPRBrelation`	`lEql(XPRBvar v)`
`XPRBexpr`	`mul(double d)` Multiply an expression with a constant factor.
`static XPRBexpr`	`mul(double d, XPRBexpr l)`
`XPRBexpr`	`mul(XPRBexpr q)` Multiply an expression with an expression.
`static XPRBexpr`	`mul(XPRBexpr l, double d)` Create the product of an expression with a constant factor.
`static XPRBexpr`	`mul(XPRBexpr q1, XPRBexpr q2)` Create the product of two expressions.
`XPRBexpr`	`mul(XPRBvar v)` Multiply an expression with a variable.
`XPRBexpr`	`neg()` Negate an expression.
`static XPRBexpr`	`neg(XPRBexpr l)` Create the negation of an expression.
`void`	`print()` Print out an expression.
`void`	`reset()` Reset an expression.
`XPRBexpr`	`setTerm(double val)`
`XPRBexpr`	`setTerm(double val, XPRBvar var)`
`XPRBexpr`	`setTerm(double val, XPRBvar var1, XPRBvar var2)`
`XPRBexpr`	`setTerm(XPRBvar var, double val)` Set a term in an expression.
`XPRBexpr`	`setTerm(XPRBvar var1, XPRBvar var2, double val)` Set a quadratic term in an expression.
`XPRBexpr`	`sqr()` Raise an expression to the power of 2
`static XPRBexpr`	`sqr(XPRBexpr l)` Create the square of an expression.
`java.lang.String`	`toString()` Provide a string representation of an expression.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

XPRBexpr
```
public XPRBexpr()
```
See Also:

XPRBexpr(0, null)

XPRBexpr
```
public XPRBexpr(double d)
```
See Also:

XPRBexpr(d, null)

XPRBexpr

public XPRBexpr(double d,
                XPRBvar v)

Create an expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);

Parameters:: d - a double constant (= coefficient or constant term); v - a variable of type XPRBvar

XPRBexpr
```
public XPRBexpr(XPRBvar v)
```
See Also:

XPRBexpr(1, v)

XPRBexpr

public XPRBexpr(XPRBvar v,
                double d)

See Also:: XPRBexpr(d, v)

XPRBexpr

public XPRBexpr(double d,
                XPRBvar v1,
                XPRBvar v2)

Create a quadratic expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBvar x2;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1,x2);

Parameters:: d - a double constant (= coefficient or constant term); v1 - a variable of type XPRBvar; v2 - a variable of type XPRBvar

XPRBexpr

public XPRBexpr(XPRBvar v1,
                XPRBvar v2,
                double d)

See Also:: XPRBexpr(d, v1,v2)

XPRBexpr

public XPRBexpr(XPRBvar v1,
                XPRBvar v2)

See Also:: XPRBexpr(1, v1,v2)

Method Detail

close
```
public void close()
```
Specified by:

close in interface java.lang.AutoCloseable

Since:

8.14

clone
```
public java.lang.Object clone()
```
Make a copy of an expression.

Overrides:

clone in class java.lang.Object

Returns:

A new expression

reset
```
public void reset()
```
Reset an expression. This method deletes the content of an expression.

getSol

public double getSol()

Get the evaluation of an expression with the current solution. This method returns the evaluation of the expression with the current solution values for all its variables that are in the problem (that is, for which a solution value is available). All other variables are treated as 0.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1;
     double sol;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL);
     l1 = new XPRBexpr(3.7, x1);
     l1.add(x2);
     expl2.lpOptimize();
     sol = l1.getSol();

Returns:: Evaluation of an expression (default 0)

neg

public XPRBexpr neg()

Negate an expression. This methods turns an expression l into the expression -1*l.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.neg();

Returns:: An expression

neg

public static XPRBexpr neg(XPRBexpr l)

Create the negation of an expression. This methods returns the negation -1*l of an expression l.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1, l2;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l2 = XPRBexpr.neg(l1);

Returns:: A new expression

add

public XPRBexpr add(XPRBexpr l)

Add an expression to an expression.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1, l2;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr(x2);
     l2.add(l1);

Parameters:: l - expression of type XPRBexpr
Returns:: An expression

add
```
public XPRBexpr add(XPRBvar v)
```
See Also:

add(v)

add
```
public XPRBexpr add(double val)
```
See Also:

add(val)

add

public static XPRBexpr add(XPRBexpr l1,
                           XPRBexpr l2)

Create the sum of two expressions.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1, l2, l3;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr(x2);
     l3 = XPRBexpr.add(l1,l2);

Parameters:: l1 - expression of type XPRBexpr; l2 - expression of type XPRBexpr
Returns:: A new expression

add

public static XPRBexpr add(XPRBexpr l,
                           XPRBvar v)

See Also:: add(l,v)

add

public static XPRBexpr add(XPRBvar v,
                           XPRBexpr l)

See Also:: add(v,l)

add

public static XPRBexpr add(XPRBexpr l,
                           double val)

See Also:: add(l,val)

add

public static XPRBexpr add(double val,
                           XPRBexpr l)

See Also:: add(val,l)

setTerm

public XPRBexpr setTerm(XPRBvar var,
                        double val)

Set a term in an expression. This method sets the coefficient of a given variable to the value val.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.setTerm(x1, 5.4);        // Set coefficient of x1 to 5.4

Parameters:: var - variable of type XPRBvar; val - value of the coefficient of the variable var
Returns:: An expression

setTerm

public XPRBexpr setTerm(double val,
                        XPRBvar var)

See Also:: setTerm(var,val)

setTerm
```
public XPRBexpr setTerm(double val)
```
See Also:

setTerm(0,val)

setTerm

public XPRBexpr setTerm(XPRBvar var1,
                        XPRBvar var2,
                        double val)

Set a quadratic term in an expression. This method sets the coefficient of the product of the given variables to the value val.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr q1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1");
     q1 = new XPRBexpr(-7.2, x1, x2);
     q1.setTerm(x1, x2, 5.4);        // Set coefficient of x1*x2 to 5.4

Parameters:: var1 - variable of type XPRBvar; var2 - variable of type XPRBvar; val - value of the coefficient of the product of the variables
Returns:: A quadratic expression

setTerm

public XPRBexpr setTerm(double val,
                        XPRBvar var1,
                        XPRBvar var2)

See Also:: setTerm(var1,var2,val)

addTerm

public XPRBexpr addTerm(XPRBvar var,
                        double val)

Add a linear term to an expression. This method adds a new term to an expression, comprising the variable var with coefficient val. If the expression already has a term with variable var, val is added to its coefficient.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.addTerm(x1, 5.4);        // New coefficient of x1: 8.1

Parameters:: var - variable of type XPRBvar; val - value of the coefficient of the variable var
Returns:: An expression

addTerm

public XPRBexpr addTerm(double val,
                        XPRBvar var)

See Also:: addTerm(var,val)

addTerm
```
public XPRBexpr addTerm(XPRBvar var)
```
See Also:

addTerm(var,1)

addTerm
```
public XPRBexpr addTerm(double val)
```
See Also:

addTerm(0,val)

addTerm

public XPRBexpr addTerm(XPRBvar var1,
                        XPRBvar var2,
                        double val)

Add a quadratic term to an expression. This method adds a new term to an expression, comprising the product of the variables var1 and var2 with coefficient val. If the expression already has a term with variables var1 and var2, then val is added to its coefficient.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr q1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1");
     q1 = new XPRBexpr(-7.2, x1, x2);
     q1.addTerm(x1, x2, 5.4);        // New coefficient of x1*x2: -1.8

Parameters:: var1 - variable of type XPRBvar; var2 - variable of type XPRBvar; val - value of the coefficient of the product of the variables
Returns:: A quadratic expression

addTerm

public XPRBexpr addTerm(double val,
                        XPRBvar var1,
                        XPRBvar var2)

See Also:: addTerm(var1,var2,val)

delTerm

public XPRBexpr delTerm(XPRBvar var)

Delete a term from an expression. This method removes the term involving the given variable var from the expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.delTerm(x1);

Parameters:: var - variable of type XPRBvar
Returns:: An expression

delTerm

public XPRBexpr delTerm(XPRBvar var1,
                        XPRBvar var2)

Delete a quadratic term from an expression. This method removes the term involving the product of the two given variables from the expression.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr q1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1");
     q1 = new XPRBexpr(-7.2, x1, x2);
     q1.delTerm(x1, x2);

Parameters:: var1 - variable of type XPRBvar; var2 - variable of type XPRBvar
Returns:: A quadratic expression

mul

public XPRBexpr mul(double d)

Multiply an expression with a constant factor.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.mul(-2);

Parameters:: d - constant value
Returns:: An expression

mul

public static XPRBexpr mul(XPRBexpr l,
                           double d)

Create the product of an expression with a constant factor.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1, l2;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l2 = XPRBexpr.mul(l1, -2);

Parameters:: l - expression of type XPRBexpr; d - constant value
Returns:: A new expression

mul

public static XPRBexpr mul(double d,
                           XPRBexpr l)

See Also:: mul(l,d)

mul

public XPRBexpr mul(XPRBvar v)
             throws java.lang.ArithmeticException

Multiply an expression with a variable.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1;
     XPRBexpr q;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     q = l1.mul(x2);

Parameters:: v - variable of type XPRBvar
Returns:: A new expression
Throws:: java.lang.ArithmeticException - If the result of the multiplication has a power higher than quadratic.

sqr

public XPRBexpr sqr()
             throws java.lang.ArithmeticException

Raise an expression to the power of 2

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     XPRBexpr q;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.sqr();

Returns:: An expression
Throws:: java.lang.ArithmeticException

sqr

public static XPRBexpr sqr(XPRBexpr l)
                    throws java.lang.ArithmeticException

Create the square of an expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     XPRBexpr q;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     q = XPRBexpr.sqr(l1);

Returns:: A new expression
Throws:: java.lang.ArithmeticException

mul

public XPRBexpr mul(XPRBexpr q)
             throws java.lang.ArithmeticException

Multiply an expression with an expression.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr q1, q2;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1");
     q1 = new XPRBexpr(-7.2, x1, x2);
     q2 = new XPRBexpr(x1.mul(3.7));
     q1.mul(q2);

Parameters:: q - expression of type XPRBexpr
Returns:: An expression
Throws:: java.lang.ArithmeticException - If the result of the multiplication has a power higher than quadratic.

mul

public static XPRBexpr mul(XPRBexpr q1,
                           XPRBexpr q2)
                    throws java.lang.ArithmeticException

Create the product of two expressions.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr q1, q2, q3;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1");
     q1 = new XPRBexpr(-7.2, x1, x2);
     q2 = new XPRBexpr(x1.mul(3.7));
     q3 = XPRBexpr.mul(q1, q2);

Parameters:: q1 - expression of type XPRBexpr; q2 - expression of type XPRBexpr
Returns:: An expression
Throws:: java.lang.ArithmeticException - If the result of the multiplication has a power higher than quadratic.

assign

public XPRBexpr assign(XPRBexpr l)

Assign an expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1, l2;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr();
     l2.assign(l1);

Parameters:: l - expression of type XPRBexpr
Returns:: An expression

getStatus
```
public int getStatus()
```
Get the status of an expression

Returns:

0 if constant, 1 if linear, 2 or 3 if quadratic

lEql

public XPRBrelation lEql(XPRBexpr l)

Create a relation of type "less or equal". Applied to an expression l1, this method creates a new relation l1<=l.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1, l2;
     XPRBrelation lr;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr(8, x2);
     lr = l1.lEql(l2);

Parameters:: l - expression of type XPRBexpr
Returns:: A new relation

lEql
```
public XPRBrelation lEql(XPRBvar v)
```
See Also:

lEql(v)

lEql
```
public XPRBrelation lEql(double val)
```
See Also:

lEql(val)

gEql

public XPRBrelation gEql(XPRBexpr l)

Create a relation of type "greater or equal". Applied to an expression l1, this method creates a new relation l1>=l.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1, l2;
     XPRBrelation lr;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr(8, x2);
     lr = l1.gEql(l2);

Parameters:: l - expression of type XPRBexpr
Returns:: A new relation

gEql
```
public XPRBrelation gEql(XPRBvar v)
```
See Also:

gEql(v)

gEql
```
public XPRBrelation gEql(double val)
```
See Also:

gEql(val)

eql

public XPRBrelation eql(XPRBexpr l)

Create a relation of type "equal". Applied to an expression l1, this method creates a new relation l1=l.

     XPRBprob expl2;
     XPRBvar x1, x2;
     XPRBexpr l1, l2;
     XPRBrelation lr;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     x2 = expl2.newVar("abc1", XPRB.PL, 0, XPRB.INFINITY);
     l1 = new XPRBexpr(3.7, x1);
     l2 = new XPRBexpr(8, x2);
     lr = l1.eql(l2);

Parameters:: l - expression of type XPRBexpr
Returns:: A new relation

eql
```
public XPRBrelation eql(XPRBvar v)
```
See Also:

eql(v)

eql
```
public XPRBrelation eql(double val)
```
See Also:

eql(val)

print

public void print()

Print out an expression. This method is not available in the Student Edition.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     l1.print();

toString

public java.lang.String toString()

Provide a string representation of an expression.

     XPRBprob expl2;
     XPRBvar x1;
     XPRBexpr l1;
     expl2 = new XPRBprob("example2");
     x1 = expl2.newVar("abc3", XPRB.UI, 1, 100);
     l1 = new XPRBexpr(3.7, x1);
     System.out.println(l1.toString());

Overrides:: toString in class java.lang.Object

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XPRBexpr

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

XPRBexpr

XPRBexpr

XPRBexpr

XPRBexpr

XPRBexpr

XPRBexpr

XPRBexpr

XPRBexpr

Method Detail

close

clone

reset

getSol

neg

neg

add

add

add

add

add

add

add

add

setTerm

setTerm

setTerm

setTerm

setTerm

addTerm

addTerm

addTerm

addTerm

addTerm

addTerm

delTerm

delTerm

mul

mul

mul

mul

sqr

sqr

mul

mul

assign

getStatus

lEql

lEql

lEql

gEql

gEql

gEql

eql

eql

eql

print

toString