Package com.singularsys.extensions.polynomials

Class PFunction

java.lang.Object

com.singularsys.extensions.polynomials.AbstractPNode

com.singularsys.extensions.polynomials.PFunction

All Implemented Interfaces:

PNodeI, java.io.Serializable, java.lang.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, java.lang.String name, PostfixMathCommandI pfmc, PNodeI[] args)

Method Summary

Modifier and Type	Method	Description
int	compareTo(PFunction fun)
void	convertToPolyArray(java.lang.String var, java.util.Map<java.lang.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)
java.lang.String	getName()
int	getNArgs()
PostfixMathCommandI	getPfmc()
int	hashCode()
PNodeI	negate()	negates node i.e.
Node	toCompactNode()	Converts to a more efficient Jep representation.
Node	toNode()	Converts the node to standard Jep format.
java.lang.String	toString()	Produces a string representation of the argument.

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

add, compareTo, div, equals, invert, isOne, isZero, mul, pow, sub

Methods inherited from class java.lang.Object

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

Constructor Detail

PFunction

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

Method Detail

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 java.lang.Object

compareTo

public int compareTo(PFunction fun)

toString

public java.lang.String toString()

Description copied from interface: PNodeI

Produces a string representation of the argument.

Specified by:

toString in interface PNodeI

Overrides:

toString in class java.lang.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 java.lang.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(java.lang.String var,
                               java.util.Map<java.lang.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()
              throws ParseException

Description copied from interface: PNodeI

negates node i.e. -x

Throws:

ParseException