Package com.singularsys.extensions.polynomials

Class PConstant

java.lang.Object

com.singularsys.extensions.polynomials.AbstractPNode

com.singularsys.extensions.polynomials.PConstant

All Implemented Interfaces:

PNodeI, Serializable, Comparable<PNodeI>

public class PConstant
extends AbstractPNode

Represents a constant.

Author:

Rich Morris Created on 14-Dec-2004

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.extensions.polynomials.AbstractPNode

pc

Constructor Summary

Constructors

Constructor	Description
PConstant(PolynomialCreator pc, Object o)

Method Summary

Modifier and Type	Method	Description
PNodeI	add(PNodeI c)	Returns the sum of this node and argument
int	compareToPConstant(PConstant c)
void	convertToPolyArray(String var, Map<Integer,PNodeI> polyArray)	Internal method for extracting coefficients
PNodeI	div(PNodeI c)	Divides this by the argument.
boolean	equalsPNode(PNodeI node)	True is nodes represent the same parse trees
PNodeI	expand()	complete expansion. (1+x)^2 --> 1+2*x+x^2
Object	getValue()
int	hashCode()
int	intValue()
PNodeI	invert()	inverts node i.e. 1/x
boolean	isInfinity()
boolean	isInteger()
boolean	isMinusOne()
boolean	isNan()
boolean	isNegative()
boolean	isOne()	True if node represents one
boolean	isPositive()
boolean	isZero()	True if node represents zero
PNodeI	mul(PNodeI c)	Multiplies this by the argument.
PNodeI	negate()	negates node i.e.
PNodeI	pow(PNodeI c)	Raise this to the argument.
PNodeI	sub(PNodeI c)	Returns the difference between this node and argument
PNodeI	substitute(PVariable var, PNodeI sub)	Substitute all occurrence of variable with its replacement.
Node	toCompactNode()	Converts to a more efficient Jep representation.
Node	toNode()	Converts the node to standard Jep format.
String	toString()	Produces a string representation of the argument.
String	toString(NumberFormat nf)

Methods inherited from class com.singularsys.extensions.polynomials.AbstractPNode

compareTo, equals

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

PConstant

public PConstant(PolynomialCreator pc,
 Object o)

Method Details

negate

public PNodeI negate()
              throws ParseException

Description copied from interface: PNodeI

negates node i.e. -x

Throws:

ParseException

add

public PNodeI add(PNodeI c)
           throws ParseException

Description copied from class: AbstractPNode

Returns the sum of this node and argument

Specified by:

add in interface PNodeI

Overrides:

add in class AbstractPNode

Parameters:

c - to add

Returns:

node representing the sum

Throws:

ParseException - on error

sub

public PNodeI sub(PNodeI c)
           throws ParseException

Description copied from class: AbstractPNode

Returns the difference between this node and argument

Specified by:

sub in interface PNodeI

Overrides:

sub in class AbstractPNode

Parameters:

c - to subtract

Returns:

node representing the difference

Throws:

ParseException - on error

mul

public PNodeI mul(PNodeI c)
           throws ParseException

Description copied from interface: PNodeI

Multiplies this by the argument.

Specified by:

mul in interface PNodeI

Overrides:

mul in class AbstractPNode

Throws:

ParseException

div

public PNodeI div(PNodeI c)
           throws ParseException

Description copied from interface: PNodeI

Divides this by the argument.

Specified by:

div in interface PNodeI

Overrides:

div in class AbstractPNode

Throws:

ParseException

invert

public PNodeI invert()
              throws ParseException

Description copied from interface: PNodeI

inverts node i.e. 1/x

Specified by:

invert in interface PNodeI

Overrides:

invert in class AbstractPNode

Throws:

ParseException

pow

public PNodeI pow(PNodeI c)
           throws ParseException

Description copied from interface: PNodeI

Raise this to the argument.

Specified by:

pow in interface PNodeI

Overrides:

pow in class AbstractPNode

Throws:

ParseException

toString

public String toString()

Description copied from interface: PNodeI

Produces a string representation of the argument.

Specified by:

toString in interface PNodeI

Overrides:

toString in class Object

isZero

public boolean isZero()

Description copied from interface: PNodeI

True if node represents zero

Specified by:

isZero in interface PNodeI

Overrides:

isZero in class AbstractPNode

isOne

public boolean isOne()

Description copied from interface: PNodeI

True if node represents one

Specified by:

isOne in interface PNodeI

Overrides:

isOne in class AbstractPNode

isMinusOne

public boolean isMinusOne()

isInfinity

public boolean isInfinity()

isNan

public boolean isNan()

isPositive

public boolean isPositive()

isNegative

public boolean isNegative()

isInteger

public boolean isInteger()

intValue

public int intValue()
             throws EvaluationException

Throws:

EvaluationException

toNode

public Node toNode()
            throws ParseException

Description copied from interface: PNodeI

Converts the node to standard Jep format.

Throws:

ParseException

toCompactNode

public Node toCompactNode()
                   throws ParseException

Description copied from interface: PNodeI

Converts to a more efficient Jep representation. Exploits the feature of the Add and Multiply operators which allow the operators to work as n-ary operators. Order of elements is altered to make for more efficient operation.

Returns:

Throws:

ParseException

compareToPConstant

public int compareToPConstant(PConstant c)

equalsPNode

public boolean equalsPNode(PNodeI node)

Description copied from interface: PNodeI

True is nodes represent the same parse trees

Specified by:

equalsPNode in interface PNodeI

Overrides:

equalsPNode in class AbstractPNode

expand

public PNodeI expand()

Description copied from interface: PNodeI

complete expansion. (1+x)^2 --> 1+2*x+x^2

getValue

public Object getValue()

Returns:

Returns the value.

convertToPolyArray

public void convertToPolyArray(String var,
 Map<Integer,PNodeI> polyArray)
                        throws ParseException

Description copied from interface: PNodeI

Internal method for extracting coefficients

Parameters:

var - variable name

polyArray - results added to this map

Throws:

ParseException

hashCode

public int hashCode()

Overrides:

hashCode in class Object

substitute

public PNodeI substitute(PVariable var,
 PNodeI sub)

Description copied from interface: PNodeI

Substitute all occurrence of variable with its replacement.

Parameters:

var - the variable

sub - the replacement

Returns:

toString

public String toString(NumberFormat nf)