Package com.singularsys.extensions.polynomials

Class PFunction

java.lang.Object

com.singularsys.extensions.polynomials.AbstractPNode

com.singularsys.extensions.polynomials.PFunction

All Implemented Interfaces:

PNodeI, Serializable, Comparable<PNodeI>

public class PFunction
extends AbstractPNode

Represents a function.

Author:

Rich Morris Created on 15-Dec-2004

See Also:

• Serialized Form

Field Summary

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

pc

Constructor Summary

Constructors

Constructor	Description
PFunction(PolynomialCreator pc, String name, PostfixMathCommandI pfmc, PNodeI[] args)

Method Summary

Modifier and Type	Method	Description
PNodeI	add(PNodeI node)	Returns the sum of this node and argument
int	compareTo(PFunction fun)
void	convertToPolyArray(String var, Map<Integer,PNodeI> polyArray)	Internal method for extracting coefficients
boolean	equalsPNode(PNodeI node)	True is nodes represent the same parse trees
PNodeI	expand()	complete expansion. (1+x)^2 --> 1+2*x+x^2
PNodeI	getArg(int i)
String	getName()
int	getNArgs()
PostfixMathCommandI	getPfmc()
int	hashCode()
PNodeI	negate()	negates node i.e.
PNodeI	sub(PNodeI node)	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, div, equals, invert, isOne, isZero, mul, pow

Methods inherited from class java.lang.Object

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

Constructor Details

PFunction

public PFunction(PolynomialCreator pc,
 String name,
 PostfixMathCommandI pfmc,
 PNodeI[] args)

Method Details

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

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(PFunction fun)

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

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

expand

public PNodeI expand()
              throws ParseException

Description copied from interface: PNodeI

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

Throws:

ParseException

getName

public String getName()

Returns:

Returns the name of the function.

getPfmc

public PostfixMathCommandI getPfmc()

Returns:

Returns the PostfixMathCommandI for the function.

getNArgs

public int getNArgs()

Returns:

the number of arguments

getArg

public PNodeI getArg(int i)

Parameters:

i -

Returns:

returns the i-th argument

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

negate

public PNodeI negate()

Description copied from interface: PNodeI

negates node i.e. -x

substitute

public PNodeI substitute(PVariable var,
 PNodeI sub)
                  throws ParseException

Description copied from interface: PNodeI

Substitute all occurrence of variable with its replacement.

Parameters:

var - the variable

sub - the replacement

Returns:

Throws:

ParseException

add

public PNodeI add(PNodeI node)
           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:

node - to add

Returns:

node representing the sum

Throws:

ParseException - on error

sub

public PNodeI sub(PNodeI node)
           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:

node - to subtract

Returns:

node representing the difference

Throws:

ParseException - on error

toString

public String toString(NumberFormat nf)