jsci.maths.symbolic

Class Variable

java.lang.Object

jsci.maths.symbolic.Expression

jsci.maths.symbolic.Variable

All Implemented Interfaces:

java.io.Serializable, Field.Member, Ring.Member, AbelianGroup.Member, Member

public class Variable
extends Expression

Variables in an Expression.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Variable(java.lang.String n, java.lang.Object valueSet)

Method Summary

Modifier and Type	Method and Description
Expression	differentiate(Variable x) Differentiation of the expression with respect to a variable
boolean	equals(java.lang.Object o)
Expression	evaluate() This method substitutes the variable with the variable values, if non-null; they can be Contants or other Expressions.
java.lang.Object	getSet()
Member	getValue() Get the value of the variable.
void	setValue(Member o) Set the value of the variable.
java.lang.String	toString()

Methods inherited from class jsci.maths.symbolic.Expression

add, difference, differentiate, divide, divide, inverse, inverse, main, multiply, negate, negative, power, product, product, rise, subtract, sum, sum

Methods inherited from class java.lang.Object

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

Constructor Detail

Variable

public Variable(java.lang.String n,
                java.lang.Object valueSet)

Parameters:

n - the name (symbol) of the variable

valueSet - the set to which the variable values belong, e.g. RealField.getInstance(). Note it is not the Class of the values (odd thing indeed).

Method Detail

setValue

public void setValue(Member o)

Set the value of the variable.

Parameters:

o - the value; can be null to unset the variable

getValue

public Member getValue()

Get the value of the variable.

Returns:

the value of the variable; null if the variable is unset.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

differentiate

public Expression differentiate(Variable x)

Description copied from class: Expression

Differentiation of the expression with respect to a variable

Specified by:

differentiate in class Expression

Parameters:

x - the variable

evaluate

public Expression evaluate()

Description copied from class: Expression

This method substitutes the variable with the variable values, if non-null; they can be Contants or other Expressions. Simplification is performed.

Specified by:

evaluate in class Expression

Returns:

the evaluated Expression. Can be a Constant.

getSet

public java.lang.Object getSet()