org.lsmp.djep.xjep

Class Eval

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

org.lsmp.djep.xjep.Eval

All Implemented Interfaces:

CommandVisitorI, PostfixMathCommandI

public class Eval
extends PostfixMathCommand
implements CommandVisitorI

Symbolic eval(x^3,x,2) operator.

Author:

R Morris. Created on 18-Jun-2003

Field Summary

Fields inherited from class org.nfunk.jep.function.PostfixMathCommand

curNumberOfParameters, numberOfParameters

Constructor Summary

Constructors

Constructor and Description
Eval() Create a function that evaluates the lhs with values given on rhs.

Method Summary

Modifier and Type	Method and Description
Node	process(Node node, Node[] children, XJep xjep) Performs the specified action on an expression tree.
void	run(Stack s) Should not be called by evaluator

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand

checkNumberOfParameters, checkStack, getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Eval

public Eval()

Create a function that evaluates the lhs with values given on rhs. e.g. eval(f,x,1,y,2) sets variable x to 1, y to 2 and evaluates f.

Method Detail

process

public Node process(Node node,
                    Node[] children,
                    XJep xjep)
             throws ParseException

Description copied from interface: CommandVisitorI

Performs the specified action on an expression tree.

Specified by:

process in interface CommandVisitorI

Parameters:

node - top node of the tree

children - the children of the node after they have been preprocessed.

xjep - a reference to the current XJep interface.

Returns:

top node of the results.

Throws:

ParseException - exception

run

public void run(Stack s)
         throws ParseException

Should not be called by evaluator

Specified by:

run in interface PostfixMathCommandI

Overrides:

run in class PostfixMathCommand

Throws:

ParseException - if run.