org.lsmp.djep.xjep.function
Class Simpson

java.lang.Object
  org.nfunk.jep.function.PostfixMathCommand
      org.lsmp.djep.xjep.function.SumType
          org.lsmp.djep.xjep.function.Simpson

All Implemented Interfaces:

PostfixMathCommandI, SpecialEvaluationI

public class Simpson

extends SumType

A sum function Sum(x^2,x,1,10) finds the sum of x^2 with x running from 1 to 10. Sum(x^2,x,1,10,2) calculates the 1^2+3^2+5^2+7^2+9^2 i.e. in steps of 2.

Author:

Rich Morris Created on 10-Sept-2004

Field Summary

Fields inherited from class org.lsmp.djep.xjep.function.SumType

name

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

curNumberOfParameters, numberOfParameters

Constructor Summary

Simpson()

Method Summary

java.lang.Object	evaluate(Node node, Variable var, double min, double max, double inc, java.lang.Object data, ParserVisitor pv, java.util.Stack stack) Evaluates the node by repeatibly setting the value of the variable from min to max, and calculating the value of the first argument.
java.lang.Object	evaluate(java.lang.Object[] elements) Evaluates the function given the set of y values.

Methods inherited from class org.lsmp.djep.xjep.function.SumType

evaluate, run

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

checkStack, getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Simpson

public Simpson()

Method Detail

evaluate

public java.lang.Object evaluate(java.lang.Object[] elements)
                          throws ParseException

Description copied from class: SumType

Evaluates the function given the set of y values. For example for Sum(x^2,x,1,5) the function will be passed the array [1,4,9,16,25].

Specified by:

evaluate in class SumType

Parameters:

elements - the y values

Returns:

the result of the function

Throws:

ParseException

evaluate

public java.lang.Object evaluate(Node node,
                                 Variable var,
                                 double min,
                                 double max,
                                 double inc,
                                 java.lang.Object data,
                                 ParserVisitor pv,
                                 java.util.Stack stack)
                          throws ParseException

Description copied from class: SumType

Evaluates the node by repeatibly setting the value of the variable from min to max, and calculating the value of the first argument. Sub classes generally do not need to implement this method as

Overrides:

evaluate in class SumType

Parameters:

node -

var -

min -

max -

inc -

data -

pv -

stack -

Returns:

Throws:

ParseException