org.lsmp.djep.matrixJep.function
Class MIf

java.lang.Object
  org.nfunk.jep.function.PostfixMathCommand
      org.lsmp.djep.matrixJep.function.MIf

All Implemented Interfaces:

MatrixSpecialEvaluationI, NaryOperatorI, PostfixMathCommandI

public class MIf

extends PostfixMathCommand

implements NaryOperatorI, MatrixSpecialEvaluationI

The if(condExpr,posExpr,negExpr) function. The value of trueExpr will be returned if condExpr is >0 (true) and value of negExpr will be returned if condExpr is <= 0 (false).

This function performs lazy evaluation so that only posExpr or negExpr will be evaluated. For Complex numbers only the real part is used.

An alternate form if(condExpr,posExpr,negExpr,zeroExpr) is also availiable. Note most computations are caried out over floating point doubles so testing for zero can be dangerous.

This function implements the SpecialEvaluationI interface so that it handles seting the value of a variable.

Author:

Rich Morris Created on 18-Nov-2003

Field Summary

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

curNumberOfParameters, numberOfParameters

Constructor Summary

MIf()

Method Summary

Dimensions	calcDim(Dimensions[] dims) Find the dimension of this node.
MatrixValueI	calcValue(MatrixValueI res, MatrixValueI[] inputs) This method should not be called.
MatrixValueI	evaluate(MatrixNodeI node, MatrixEvaluator visitor, MatrixJep j) Evaluate the node, uses lazy evaluation.

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

checkStack, getNumberOfParameters, run, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.nfunk.jep.function.PostfixMathCommandI

getNumberOfParameters, run, setCurNumberOfParameters

Constructor Detail

MIf

public MIf()

Method Detail

calcDim

public Dimensions calcDim(Dimensions[] dims)
                   throws ParseException

Find the dimension of this node.

Specified by:

calcDim in interface NaryOperatorI

Throws:

ParseException

calcValue

public MatrixValueI calcValue(MatrixValueI res,
                              MatrixValueI[] inputs)
                       throws ParseException

This method should not be called. Use evaluate(org.lsmp.djep.matrixJep.nodeTypes.MatrixNodeI, org.lsmp.djep.matrixJep.MatrixEvaluator, org.lsmp.djep.matrixJep.MatrixJep) instead.

Specified by:

calcValue in interface NaryOperatorI

Throws:

ParseException

evaluate

public MatrixValueI evaluate(MatrixNodeI node,
                             MatrixEvaluator visitor,
                             MatrixJep j)
                      throws ParseException

Evaluate the node, uses lazy evaluation.

Specified by:

evaluate in interface MatrixSpecialEvaluationI

Parameters:

node - The top node.

visitor - The parser visitor

j - The current MatrixJep instance.

Returns:

Value after evaluation.

Throws:

ParseException