org.lsmp.djep.matrixJep.function

Class MDiff

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

org.lsmp.djep.matrixJep.function.MDiff

All Implemented Interfaces:

SpecialPreProcessorI, PostfixMathCommandI

public class MDiff
extends PostfixMathCommand
implements SpecialPreProcessorI

Author:

Rich Morris Created on 14-Feb-2005

Field Summary

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

curNumberOfParameters, numberOfParameters

Constructor Summary

Constructors

Constructor and Description
MDiff()

Method Summary

Modifier and Type	Method and Description
MatrixNodeI	preprocess(ASTFunNode node, MatrixPreprocessor visitor, MatrixJep jep, MatrixNodeFactory nf) Subverts the preprocessing stage.

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

checkNumberOfParameters, checkStack, getNumberOfParameters, run, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

MDiff

public MDiff()

Method Detail

preprocess

public MatrixNodeI preprocess(ASTFunNode node,
                              MatrixPreprocessor visitor,
                              MatrixJep jep,
                              MatrixNodeFactory nf)
                       throws ParseException

Description copied from interface: SpecialPreProcessorI

Subverts the preprocessing stage. Preprocessing performs a number of operations:

1. Converts each node into one of the subtypes of MatrixNodeI
2. Calculate the dimensions for the results
3. Performs any special symbolic operations such as differentation

In general the first step in preprocessing is to run the preprocessor on the children of the node. This can be done using

 MatrixNodeI children[] = visitor.visitChildrenAsArray(node,null);
 

The final step is to construct a node of the correct type. The MatrixNodeFactory argument has a number of methods to do this. For example

 return (ASTMFunNode) nf.buildOperatorNode(node.getOperator(),children,rhsDim);
 

Note how the dimension is specified.

Specified by:

preprocess in interface SpecialPreProcessorI

Parameters:

node - the top node of the tree representing the function and its arguments.

visitor - A reference to the preprocessing visitor.

jep - A reference of the MatrixJep instance.

nf - A reference to the node factory object.

Returns:

A new MatrixNodeI representing the converted function.

Throws:

ParseException - if some error occurs.