com.singularsys.extensions.polynomials

Class PVariable

java.lang.Object

com.singularsys.extensions.polynomials.AbstractPNode

com.singularsys.extensions.polynomials.PVariable

All Implemented Interfaces:

PNodeI, java.lang.Comparable<PNodeI>

public class PVariable
extends AbstractPNode

Represents a variable.

Author:

Rich Morris Created on 14-Dec-2004

Field Summary

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

pc

Constructor Summary

Constructors

Constructor and Description
PVariable(PolynomialCreator pc, Variable var)

Method Summary

Modifier and Type	Method and Description
PNodeI	add(PNodeI node) Adds a node to this one.
int	compareTo(PVariable vf) this < arg ---> -1 this > arg ---> 1
void	convertToPolyArray(java.lang.String var, java.util.Map<java.lang.Integer,PNodeI> polyArray) Internal method for extracting coefficients
boolean	equalsIgnoreConstant(PNodeI node)
boolean	equalsPNode(PNodeI node) True is nodes represent the same parse trees
PNodeI	expand() complete expansion. (1+x)^2 --> 1+2*x+x^2
java.lang.String	getName()
Variable	getVariable()
PNodeI	negate() negates node i.e.
PNodeI	sub(PNodeI node) Subtracts the argument from this.
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

compareTo, div, invert, isOne, isZero, mul, pow

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.singularsys.extensions.polynomials.PNodeI

equals

Constructor Detail

PVariable

public PVariable(PolynomialCreator pc,
                 Variable var)

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

add

public PNodeI add(PNodeI node)
           throws ParseException

Description copied from interface: PNodeI

Adds a node to this one.

Specified by:

add in interface PNodeI

Overrides:

add in class AbstractPNode

Throws:

ParseException

sub

public PNodeI sub(PNodeI node)
           throws ParseException

Description copied from interface: PNodeI

Subtracts the argument from this.

Specified by:

sub in interface PNodeI

Overrides:

sub in class AbstractPNode

Throws:

ParseException

compareTo

public int compareTo(PVariable vf)

this < arg ---> -1 this > arg ---> 1

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()

Description copied from interface: PNodeI

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

getVariable

public Variable getVariable()

Returns:

Returns the variable.

getName

public java.lang.String getName()

Returns:

Returns the name of the variable

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

equalsIgnoreConstant

public boolean equalsIgnoreConstant(PNodeI node)