Trapezium

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

All Implemented Interfaces:

Serializable, CallbackEvaluationI, PostfixMathCommandI

Direct Known Subclasses:

Simpson
```
public class Trapezium
extends SumType
```
The trapezium rule for approximation to a definite integral. h * (y0 + yn + 2(y1+y2+...+y_(n-1)) /2 where h = (xn-x0)/n, yi = f(xi) Trapezium(x^2,x,0,10,0.5) finds an approximation for int(x^2) where x runs from 0 to 10 in steps of h=0.5.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor and Description

Trapezium()

Trapezium(String name)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Object`	`evaluate(Node node, Variable var, double min, double max, double inc, EvaluatorI pv)` Evaluates the node by repeatibly setting the value of the variable from min to max, and calculating the value of the first argument.
`Object`	`evaluate(Object[] elements)` Evaluates the function given the set of y values.

Methods inherited from class org.lsmp.djep.xjep.function.SumType
checkNumberOfParameters, evaluate, run

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand
getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Trapezium
```
public Trapezium()
```
  - Trapezium
```
public Trapezium(String name)
```
- Method Detail
  - evaluate
```
public Object evaluate(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 Object evaluate(Node node,
                       Variable var,
                       double min,
                       double max,
                       double inc,
                       EvaluatorI pv)
                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 SumType.evaluate(Object[]) is more useful. If they do they should follow the pattern used here.
    
    Overrides:
    
    evaluate in class SumType
    
    Returns:
    
    the result of evaluation
    
    Throws:
    
    ParseException

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Jas4pp 1.5 © Java Analysis Studio for Particle Physics