org.lsmp.djep.vectorJep

Class VectorJep

java.lang.Object

org.nfunk.jep.JEP

org.lsmp.djep.vectorJep.VectorJep

public class VectorJep
extends JEP

An extension of JEP with support for basic vectors and matrices. Use this class instead of JEP if you wish to use vectors and matrices.

Author:

Rich Morris Created on 19-Dec-2003

Field Summary

Fields inherited from class org.nfunk.jep.JEP

allowAssignment, allowUndeclared, errorList, ev, funTab, implicitMul, numberFactory, opSet, parser, symTab

Constructor Summary

Constructors

Constructor and Description
VectorJep()
VectorJep(JEP j)

Method Summary

Modifier and Type	Method and Description
void	addStandardFunctions() Adds the standard functions to the parser.
Object	evaluate(Node node) Evaluate a node.
Object	evaluateRaw(Node node) Evaluate a node.
void	setElementMultiply(boolean value) When set the multiplication of vectors and matrices will be element by element.

Methods inherited from class org.nfunk.jep.JEP

addComplex, addConstant, addFunction, addStandardConstants, addVariable, addVariable, addVariable, getAllowAssignment, getAllowUndeclared, getComplexValue, getErrorInfo, getEvaluatorVisitor, getFunctionTable, getImplicitMul, getNumberFactory, getOperatorSet, getParser, getSymbolTable, getTopNode, getTraverse, getValue, getValueAsObject, getVar, getVarValue, hasError, initFunTab, initSymTab, parse, parseExpression, removeFunction, removeVariable, setAllowAssignment, setAllowUndeclared, setImplicitMul, setTraverse, setVarValue

Methods inherited from class java.lang.Object

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

Constructor Detail

VectorJep

public VectorJep()

VectorJep

public VectorJep(JEP j)

Method Detail

addStandardFunctions

public void addStandardFunctions()

Description copied from class: JEP

Adds the standard functions to the parser. If this function is not called before parsing an expression, functions such as sin() or cos() would produce an "Unrecognized function..." error. In most cases, this method should be called immediately after the JEP object is created.

Overrides:

addStandardFunctions in class JEP

evaluate

public Object evaluate(Node node)
                throws ParseException

Evaluate a node. If the result is a scaler it will be unwrapped, i.e. it will return a Double and not a Scaler.

Overrides:

evaluate in class JEP

Parameters:

node - the top node of the tree representing the expression.

Returns:

The value of the expression

Throws:

ParseException - if for some reason the expression could not be evaluated

evaluateRaw

public Object evaluateRaw(Node node)
                   throws Exception

Evaluate a node. Does not unwrap scalers.

Throws:

Exception

setElementMultiply

public void setElementMultiply(boolean value)

When set the multiplication of vectors and matrices will be element by element. Otherwise multiplication will be matrix multiplication (the default).